rx.c 119.3 KB
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/*
 * Copyright 2002-2005, Instant802 Networks, Inc.
 * Copyright 2005-2006, Devicescape Software, Inc.
 * Copyright 2006-2007	Jiri Benc <jbenc@suse.cz>
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 * Copyright 2007-2010	Johannes Berg <johannes@sipsolutions.net>
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 * Copyright 2013-2014  Intel Mobile Communications GmbH
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 * Copyright(c) 2015 - 2016 Intel Deutschland GmbH
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 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

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#include <linux/jiffies.h>
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#include <linux/slab.h>
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#include <linux/kernel.h>
#include <linux/skbuff.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
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#include <linux/rcupdate.h>
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#include <linux/export.h>
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#include <linux/bitops.h>
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#include <net/mac80211.h>
#include <net/ieee80211_radiotap.h>
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#include <asm/unaligned.h>
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#include "ieee80211_i.h"
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#include "driver-ops.h"
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#include "led.h"
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#include "mesh.h"
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#include "wep.h"
#include "wpa.h"
#include "tkip.h"
#include "wme.h"
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#include "rate.h"
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static inline void ieee80211_rx_stats(struct net_device *dev, u32 len)
{
	struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);

	u64_stats_update_begin(&tstats->syncp);
	tstats->rx_packets++;
	tstats->rx_bytes += len;
	u64_stats_update_end(&tstats->syncp);
}

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static u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len,
			       enum nl80211_iftype type)
{
	__le16 fc = hdr->frame_control;

	if (ieee80211_is_data(fc)) {
		if (len < 24) /* drop incorrect hdr len (data) */
			return NULL;

		if (ieee80211_has_a4(fc))
			return NULL;
		if (ieee80211_has_tods(fc))
			return hdr->addr1;
		if (ieee80211_has_fromds(fc))
			return hdr->addr2;

		return hdr->addr3;
	}

	if (ieee80211_is_mgmt(fc)) {
		if (len < 24) /* drop incorrect hdr len (mgmt) */
			return NULL;
		return hdr->addr3;
	}

	if (ieee80211_is_ctl(fc)) {
		if (ieee80211_is_pspoll(fc))
			return hdr->addr1;

		if (ieee80211_is_back_req(fc)) {
			switch (type) {
			case NL80211_IFTYPE_STATION:
				return hdr->addr2;
			case NL80211_IFTYPE_AP:
			case NL80211_IFTYPE_AP_VLAN:
				return hdr->addr1;
			default:
				break; /* fall through to the return */
			}
		}
	}

	return NULL;
}

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/*
 * monitor mode reception
 *
 * This function cleans up the SKB, i.e. it removes all the stuff
 * only useful for monitoring.
 */
static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
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					   struct sk_buff *skb,
					   unsigned int rtap_vendor_space)
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{
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	if (ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)) {
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		if (likely(skb->len > FCS_LEN))
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			__pskb_trim(skb, skb->len - FCS_LEN);
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		else {
			/* driver bug */
			WARN_ON(1);
			dev_kfree_skb(skb);
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			return NULL;
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		}
	}

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	__pskb_pull(skb, rtap_vendor_space);

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	return skb;
}

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static inline bool should_drop_frame(struct sk_buff *skb, int present_fcs_len,
				     unsigned int rtap_vendor_space)
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{
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	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
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	struct ieee80211_hdr *hdr;

	hdr = (void *)(skb->data + rtap_vendor_space);
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	if (status->flag & (RX_FLAG_FAILED_FCS_CRC |
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			    RX_FLAG_FAILED_PLCP_CRC |
			    RX_FLAG_ONLY_MONITOR))
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		return true;

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	if (unlikely(skb->len < 16 + present_fcs_len + rtap_vendor_space))
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		return true;

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	if (ieee80211_is_ctl(hdr->frame_control) &&
	    !ieee80211_is_pspoll(hdr->frame_control) &&
	    !ieee80211_is_back_req(hdr->frame_control))
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		return true;

	return false;
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}

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static int
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ieee80211_rx_radiotap_hdrlen(struct ieee80211_local *local,
			     struct ieee80211_rx_status *status,
			     struct sk_buff *skb)
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{
	int len;

	/* always present fields */
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	len = sizeof(struct ieee80211_radiotap_header) + 8;
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	/* allocate extra bitmaps */
	if (status->chains)
		len += 4 * hweight8(status->chains);
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	if (ieee80211_have_rx_timestamp(status)) {
		len = ALIGN(len, 8);
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		len += 8;
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	}
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	if (ieee80211_hw_check(&local->hw, SIGNAL_DBM))
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		len += 1;

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	/* antenna field, if we don't have per-chain info */
	if (!status->chains)
		len += 1;

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	/* padding for RX_FLAGS if necessary */
	len = ALIGN(len, 2);
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	if (status->flag & RX_FLAG_HT) /* HT info */
		len += 3;

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	if (status->flag & RX_FLAG_AMPDU_DETAILS) {
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		len = ALIGN(len, 4);
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		len += 8;
	}

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	if (status->flag & RX_FLAG_VHT) {
		len = ALIGN(len, 2);
		len += 12;
	}

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	if (local->hw.radiotap_timestamp.units_pos >= 0) {
		len = ALIGN(len, 8);
		len += 12;
	}

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	if (status->chains) {
		/* antenna and antenna signal fields */
		len += 2 * hweight8(status->chains);
	}

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	if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
		struct ieee80211_vendor_radiotap *rtap = (void *)skb->data;

		/* vendor presence bitmap */
		len += 4;
		/* alignment for fixed 6-byte vendor data header */
		len = ALIGN(len, 2);
		/* vendor data header */
		len += 6;
		if (WARN_ON(rtap->align == 0))
			rtap->align = 1;
		len = ALIGN(len, rtap->align);
		len += rtap->len + rtap->pad;
	}

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	return len;
}

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/*
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 * ieee80211_add_rx_radiotap_header - add radiotap header
 *
 * add a radiotap header containing all the fields which the hardware provided.
 */
static void
ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
				 struct sk_buff *skb,
				 struct ieee80211_rate *rate,
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				 int rtap_len, bool has_fcs)
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{
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	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
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	struct ieee80211_radiotap_header *rthdr;
	unsigned char *pos;
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	__le32 *it_present;
	u32 it_present_val;
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	u16 rx_flags = 0;
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	u16 channel_flags = 0;
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	int mpdulen, chain;
	unsigned long chains = status->chains;
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	struct ieee80211_vendor_radiotap rtap = {};

	if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
		rtap = *(struct ieee80211_vendor_radiotap *)skb->data;
		/* rtap.len and rtap.pad are undone immediately */
		skb_pull(skb, sizeof(rtap) + rtap.len + rtap.pad);
	}
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	mpdulen = skb->len;
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	if (!(has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)))
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		mpdulen += FCS_LEN;
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	rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
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	memset(rthdr, 0, rtap_len - rtap.len - rtap.pad);
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	it_present = &rthdr->it_present;
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	/* radiotap header, set always present flags */
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	rthdr->it_len = cpu_to_le16(rtap_len);
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	it_present_val = BIT(IEEE80211_RADIOTAP_FLAGS) |
			 BIT(IEEE80211_RADIOTAP_CHANNEL) |
			 BIT(IEEE80211_RADIOTAP_RX_FLAGS);

	if (!status->chains)
		it_present_val |= BIT(IEEE80211_RADIOTAP_ANTENNA);

	for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
		it_present_val |=
			BIT(IEEE80211_RADIOTAP_EXT) |
			BIT(IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE);
		put_unaligned_le32(it_present_val, it_present);
		it_present++;
		it_present_val = BIT(IEEE80211_RADIOTAP_ANTENNA) |
				 BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
	}
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	if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
		it_present_val |= BIT(IEEE80211_RADIOTAP_VENDOR_NAMESPACE) |
				  BIT(IEEE80211_RADIOTAP_EXT);
		put_unaligned_le32(it_present_val, it_present);
		it_present++;
		it_present_val = rtap.present;
	}

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	put_unaligned_le32(it_present_val, it_present);

	pos = (void *)(it_present + 1);

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	/* the order of the following fields is important */

	/* IEEE80211_RADIOTAP_TSFT */
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	if (ieee80211_have_rx_timestamp(status)) {
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		/* padding */
		while ((pos - (u8 *)rthdr) & 7)
			*pos++ = 0;
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		put_unaligned_le64(
			ieee80211_calculate_rx_timestamp(local, status,
							 mpdulen, 0),
			pos);
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		rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
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		pos += 8;
	}

	/* IEEE80211_RADIOTAP_FLAGS */
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	if (has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS))
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		*pos |= IEEE80211_RADIOTAP_F_FCS;
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	if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
		*pos |= IEEE80211_RADIOTAP_F_BADFCS;
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	if (status->flag & RX_FLAG_SHORTPRE)
		*pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
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	pos++;

	/* IEEE80211_RADIOTAP_RATE */
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	if (!rate || status->flag & (RX_FLAG_HT | RX_FLAG_VHT)) {
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		/*
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		 * Without rate information don't add it. If we have,
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		 * MCS information is a separate field in radiotap,
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		 * added below. The byte here is needed as padding
		 * for the channel though, so initialise it to 0.
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		 */
		*pos = 0;
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	} else {
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		int shift = 0;
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		rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
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		if (status->flag & RX_FLAG_10MHZ)
			shift = 1;
		else if (status->flag & RX_FLAG_5MHZ)
			shift = 2;
		*pos = DIV_ROUND_UP(rate->bitrate, 5 * (1 << shift));
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	}
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	pos++;

	/* IEEE80211_RADIOTAP_CHANNEL */
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	put_unaligned_le16(status->freq, pos);
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	pos += 2;
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	if (status->flag & RX_FLAG_10MHZ)
		channel_flags |= IEEE80211_CHAN_HALF;
	else if (status->flag & RX_FLAG_5MHZ)
		channel_flags |= IEEE80211_CHAN_QUARTER;

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	if (status->band == NL80211_BAND_5GHZ)
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		channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ;
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	else if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
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		channel_flags |= IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ;
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	else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
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		channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ;
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	else if (rate)
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		channel_flags |= IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ;
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	else
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		channel_flags |= IEEE80211_CHAN_2GHZ;
	put_unaligned_le16(channel_flags, pos);
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	pos += 2;

	/* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
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	if (ieee80211_hw_check(&local->hw, SIGNAL_DBM) &&
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	    !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
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		*pos = status->signal;
		rthdr->it_present |=
			cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
		pos++;
	}

	/* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */

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	if (!status->chains) {
		/* IEEE80211_RADIOTAP_ANTENNA */
		*pos = status->antenna;
		pos++;
	}
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	/* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */

	/* IEEE80211_RADIOTAP_RX_FLAGS */
	/* ensure 2 byte alignment for the 2 byte field as required */
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	if ((pos - (u8 *)rthdr) & 1)
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		*pos++ = 0;
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	if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
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		rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
	put_unaligned_le16(rx_flags, pos);
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	pos += 2;
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	if (status->flag & RX_FLAG_HT) {
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		unsigned int stbc;

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		rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
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		*pos++ = local->hw.radiotap_mcs_details;
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		*pos = 0;
		if (status->flag & RX_FLAG_SHORT_GI)
			*pos |= IEEE80211_RADIOTAP_MCS_SGI;
		if (status->flag & RX_FLAG_40MHZ)
			*pos |= IEEE80211_RADIOTAP_MCS_BW_40;
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		if (status->flag & RX_FLAG_HT_GF)
			*pos |= IEEE80211_RADIOTAP_MCS_FMT_GF;
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		if (status->flag & RX_FLAG_LDPC)
			*pos |= IEEE80211_RADIOTAP_MCS_FEC_LDPC;
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		stbc = (status->flag & RX_FLAG_STBC_MASK) >> RX_FLAG_STBC_SHIFT;
		*pos |= stbc << IEEE80211_RADIOTAP_MCS_STBC_SHIFT;
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		pos++;
		*pos++ = status->rate_idx;
	}
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	if (status->flag & RX_FLAG_AMPDU_DETAILS) {
		u16 flags = 0;

		/* ensure 4 byte alignment */
		while ((pos - (u8 *)rthdr) & 3)
			pos++;
		rthdr->it_present |=
			cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS);
		put_unaligned_le32(status->ampdu_reference, pos);
		pos += 4;
		if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN)
			flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN;
		if (status->flag & RX_FLAG_AMPDU_IS_LAST)
			flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST;
		if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR)
			flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR;
		if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
			flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN;
		put_unaligned_le16(flags, pos);
		pos += 2;
		if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
			*pos++ = status->ampdu_delimiter_crc;
		else
			*pos++ = 0;
		*pos++ = 0;
	}
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	if (status->flag & RX_FLAG_VHT) {
		u16 known = local->hw.radiotap_vht_details;

		rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
		put_unaligned_le16(known, pos);
		pos += 2;
		/* flags */
		if (status->flag & RX_FLAG_SHORT_GI)
			*pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
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		/* in VHT, STBC is binary */
		if (status->flag & RX_FLAG_STBC_MASK)
			*pos |= IEEE80211_RADIOTAP_VHT_FLAG_STBC;
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		if (status->vht_flag & RX_VHT_FLAG_BF)
			*pos |= IEEE80211_RADIOTAP_VHT_FLAG_BEAMFORMED;
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		pos++;
		/* bandwidth */
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		if (status->vht_flag & RX_VHT_FLAG_80MHZ)
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			*pos++ = 4;
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		else if (status->vht_flag & RX_VHT_FLAG_160MHZ)
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			*pos++ = 11;
		else if (status->flag & RX_FLAG_40MHZ)
			*pos++ = 1;
		else /* 20 MHz */
			*pos++ = 0;
		/* MCS/NSS */
		*pos = (status->rate_idx << 4) | status->vht_nss;
		pos += 4;
		/* coding field */
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		if (status->flag & RX_FLAG_LDPC)
			*pos |= IEEE80211_RADIOTAP_CODING_LDPC_USER0;
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		pos++;
		/* group ID */
		pos++;
		/* partial_aid */
		pos += 2;
	}

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	if (local->hw.radiotap_timestamp.units_pos >= 0) {
		u16 accuracy = 0;
		u8 flags = IEEE80211_RADIOTAP_TIMESTAMP_FLAG_32BIT;

		rthdr->it_present |=
			cpu_to_le32(1 << IEEE80211_RADIOTAP_TIMESTAMP);

		/* ensure 8 byte alignment */
		while ((pos - (u8 *)rthdr) & 7)
			pos++;

		put_unaligned_le64(status->device_timestamp, pos);
		pos += sizeof(u64);

		if (local->hw.radiotap_timestamp.accuracy >= 0) {
			accuracy = local->hw.radiotap_timestamp.accuracy;
			flags |= IEEE80211_RADIOTAP_TIMESTAMP_FLAG_ACCURACY;
		}
		put_unaligned_le16(accuracy, pos);
		pos += sizeof(u16);

		*pos++ = local->hw.radiotap_timestamp.units_pos;
		*pos++ = flags;
	}

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	for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
		*pos++ = status->chain_signal[chain];
		*pos++ = chain;
	}
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	if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
		/* ensure 2 byte alignment for the vendor field as required */
		if ((pos - (u8 *)rthdr) & 1)
			*pos++ = 0;
		*pos++ = rtap.oui[0];
		*pos++ = rtap.oui[1];
		*pos++ = rtap.oui[2];
		*pos++ = rtap.subns;
		put_unaligned_le16(rtap.len, pos);
		pos += 2;
		/* align the actual payload as requested */
		while ((pos - (u8 *)rthdr) & (rtap.align - 1))
			*pos++ = 0;
		/* data (and possible padding) already follows */
	}
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}

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/*
 * This function copies a received frame to all monitor interfaces and
 * returns a cleaned-up SKB that no longer includes the FCS nor the
 * radiotap header the driver might have added.
 */
static struct sk_buff *
ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
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		     struct ieee80211_rate *rate)
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{
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	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
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	struct ieee80211_sub_if_data *sdata;
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	int rt_hdrlen, needed_headroom;
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	struct sk_buff *skb, *skb2;
	struct net_device *prev_dev = NULL;
	int present_fcs_len = 0;
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	unsigned int rtap_vendor_space = 0;
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	struct ieee80211_mgmt *mgmt;
	struct ieee80211_sub_if_data *monitor_sdata =
		rcu_dereference(local->monitor_sdata);
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	if (unlikely(status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA)) {
		struct ieee80211_vendor_radiotap *rtap = (void *)origskb->data;

		rtap_vendor_space = sizeof(*rtap) + rtap->len + rtap->pad;
	}
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	/*
	 * First, we may need to make a copy of the skb because
	 *  (1) we need to modify it for radiotap (if not present), and
	 *  (2) the other RX handlers will modify the skb we got.
	 *
	 * We don't need to, of course, if we aren't going to return
	 * the SKB because it has a bad FCS/PLCP checksum.
	 */
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	if (ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS))
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		present_fcs_len = FCS_LEN;

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	/* ensure hdr->frame_control and vendor radiotap data are in skb head */
	if (!pskb_may_pull(origskb, 2 + rtap_vendor_space)) {
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		dev_kfree_skb(origskb);
		return NULL;
	}

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	if (!local->monitors || (status->flag & RX_FLAG_SKIP_MONITOR)) {
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		if (should_drop_frame(origskb, present_fcs_len,
				      rtap_vendor_space)) {
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			dev_kfree_skb(origskb);
			return NULL;
		}

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		return remove_monitor_info(local, origskb, rtap_vendor_space);
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	}

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	/* room for the radiotap header based on driver features */
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	rt_hdrlen = ieee80211_rx_radiotap_hdrlen(local, status, origskb);
	needed_headroom = rt_hdrlen - rtap_vendor_space;
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	if (should_drop_frame(origskb, present_fcs_len, rtap_vendor_space)) {
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		/* only need to expand headroom if necessary */
		skb = origskb;
		origskb = NULL;

		/*
		 * This shouldn't trigger often because most devices have an
		 * RX header they pull before we get here, and that should
		 * be big enough for our radiotap information. We should
		 * probably export the length to drivers so that we can have
		 * them allocate enough headroom to start with.
		 */
		if (skb_headroom(skb) < needed_headroom &&
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		    pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
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			dev_kfree_skb(skb);
			return NULL;
		}
	} else {
		/*
		 * Need to make a copy and possibly remove radiotap header
		 * and FCS from the original.
		 */
		skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);

584 585
		origskb = remove_monitor_info(local, origskb,
					      rtap_vendor_space);
586 587 588 589 590

		if (!skb)
			return origskb;
	}

J
Johannes Berg 已提交
591
	/* prepend radiotap information */
592
	ieee80211_add_rx_radiotap_header(local, skb, rate, rt_hdrlen, true);
593

594
	skb_reset_mac_header(skb);
595 596 597 598 599
	skb->ip_summed = CHECKSUM_UNNECESSARY;
	skb->pkt_type = PACKET_OTHERHOST;
	skb->protocol = htons(ETH_P_802_2);

	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
600
		if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
601 602
			continue;

603
		if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
604 605
			continue;

606
		if (!ieee80211_sdata_running(sdata))
607 608
			continue;

609 610 611 612
		if (prev_dev) {
			skb2 = skb_clone(skb, GFP_ATOMIC);
			if (skb2) {
				skb2->dev = prev_dev;
613
				netif_receive_skb(skb2);
614 615 616 617
			}
		}

		prev_dev = sdata->dev;
618
		ieee80211_rx_stats(sdata->dev, skb->len);
619 620
	}

621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637
	mgmt = (void *)skb->data;
	if (monitor_sdata &&
	    skb->len >= IEEE80211_MIN_ACTION_SIZE + 1 + VHT_MUMIMO_GROUPS_DATA_LEN &&
	    ieee80211_is_action(mgmt->frame_control) &&
	    mgmt->u.action.category == WLAN_CATEGORY_VHT &&
	    mgmt->u.action.u.vht_group_notif.action_code == WLAN_VHT_ACTION_GROUPID_MGMT &&
	    is_valid_ether_addr(monitor_sdata->u.mntr.mu_follow_addr) &&
	    ether_addr_equal(mgmt->da, monitor_sdata->u.mntr.mu_follow_addr)) {
		struct sk_buff *mu_skb = skb_copy(skb, GFP_ATOMIC);

		if (mu_skb) {
			mu_skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
			skb_queue_tail(&monitor_sdata->skb_queue, mu_skb);
			ieee80211_queue_work(&local->hw, &monitor_sdata->work);
		}
	}

638 639
	if (prev_dev) {
		skb->dev = prev_dev;
640
		netif_receive_skb(skb);
641 642 643 644 645 646
	} else
		dev_kfree_skb(skb);

	return origskb;
}

647
static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
648
{
649
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
650
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
651
	int tid, seqno_idx, security_idx;
652 653

	/* does the frame have a qos control field? */
654 655
	if (ieee80211_is_data_qos(hdr->frame_control)) {
		u8 *qc = ieee80211_get_qos_ctl(hdr);
656
		/* frame has qos control */
657
		tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
658
		if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
659
			status->rx_flags |= IEEE80211_RX_AMSDU;
660 661 662

		seqno_idx = tid;
		security_idx = tid;
663
	} else {
664 665 666 667 668 669 670 671 672 673 674
		/*
		 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
		 *
		 *	Sequence numbers for management frames, QoS data
		 *	frames with a broadcast/multicast address in the
		 *	Address 1 field, and all non-QoS data frames sent
		 *	by QoS STAs are assigned using an additional single
		 *	modulo-4096 counter, [...]
		 *
		 * We also use that counter for non-QoS STAs.
		 */
675
		seqno_idx = IEEE80211_NUM_TIDS;
676 677
		security_idx = 0;
		if (ieee80211_is_mgmt(hdr->frame_control))
678
			security_idx = IEEE80211_NUM_TIDS;
679
		tid = 0;
680
	}
681

682 683
	rx->seqno_idx = seqno_idx;
	rx->security_idx = security_idx;
684 685 686
	/* Set skb->priority to 1d tag if highest order bit of TID is not set.
	 * For now, set skb->priority to 0 for other cases. */
	rx->skb->priority = (tid > 7) ? 0 : tid;
687
}
688

689 690 691 692 693 694 695 696 697 698 699
/**
 * DOC: Packet alignment
 *
 * Drivers always need to pass packets that are aligned to two-byte boundaries
 * to the stack.
 *
 * Additionally, should, if possible, align the payload data in a way that
 * guarantees that the contained IP header is aligned to a four-byte
 * boundary. In the case of regular frames, this simply means aligning the
 * payload to a four-byte boundary (because either the IP header is directly
 * contained, or IV/RFC1042 headers that have a length divisible by four are
700 701 702
 * in front of it).  If the payload data is not properly aligned and the
 * architecture doesn't support efficient unaligned operations, mac80211
 * will align the data.
703 704 705 706 707 708 709
 *
 * With A-MSDU frames, however, the payload data address must yield two modulo
 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
 * push the IP header further back to a multiple of four again. Thankfully, the
 * specs were sane enough this time around to require padding each A-MSDU
 * subframe to a length that is a multiple of four.
 *
L
Lucas De Marchi 已提交
710
 * Padding like Atheros hardware adds which is between the 802.11 header and
711 712 713 714
 * the payload is not supported, the driver is required to move the 802.11
 * header to be directly in front of the payload in that case.
 */
static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
715
{
716
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
717
	WARN_ON_ONCE((unsigned long)rx->skb->data & 1);
718
#endif
719 720
}

721

722 723
/* rx handlers */

724 725 726 727
static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
{
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;

728
	if (is_multicast_ether_addr(hdr->addr1))
729 730
		return 0;

731
	return ieee80211_is_robust_mgmt_frame(skb);
732 733 734 735 736 737 738
}


static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
{
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;

739
	if (!is_multicast_ether_addr(hdr->addr1))
740 741
		return 0;

742
	return ieee80211_is_robust_mgmt_frame(skb);
743 744 745 746 747 748 749 750
}


/* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
{
	struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
	struct ieee80211_mmie *mmie;
751
	struct ieee80211_mmie_16 *mmie16;
752

J
Johannes Berg 已提交
753
	if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da))
754 755
		return -1;

756
	if (!ieee80211_is_robust_mgmt_frame(skb))
757 758 759 760
		return -1; /* not a robust management frame */

	mmie = (struct ieee80211_mmie *)
		(skb->data + skb->len - sizeof(*mmie));
761 762 763 764 765 766 767 768 769 770 771 772
	if (mmie->element_id == WLAN_EID_MMIE &&
	    mmie->length == sizeof(*mmie) - 2)
		return le16_to_cpu(mmie->key_id);

	mmie16 = (struct ieee80211_mmie_16 *)
		(skb->data + skb->len - sizeof(*mmie16));
	if (skb->len >= 24 + sizeof(*mmie16) &&
	    mmie16->element_id == WLAN_EID_MMIE &&
	    mmie16->length == sizeof(*mmie16) - 2)
		return le16_to_cpu(mmie16->key_id);

	return -1;
773 774
}

775 776
static int ieee80211_get_cs_keyid(const struct ieee80211_cipher_scheme *cs,
				  struct sk_buff *skb)
777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795
{
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
	__le16 fc;
	int hdrlen;
	u8 keyid;

	fc = hdr->frame_control;
	hdrlen = ieee80211_hdrlen(fc);

	if (skb->len < hdrlen + cs->hdr_len)
		return -EINVAL;

	skb_copy_bits(skb, hdrlen + cs->key_idx_off, &keyid, 1);
	keyid &= cs->key_idx_mask;
	keyid >>= cs->key_idx_shift;

	return keyid;
}

J
Johannes Berg 已提交
796
static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
797
{
798
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
799
	char *dev_addr = rx->sdata->vif.addr;
800

801
	if (ieee80211_is_data(hdr->frame_control)) {
802 803
		if (is_multicast_ether_addr(hdr->addr1)) {
			if (ieee80211_has_tods(hdr->frame_control) ||
J
Johannes Berg 已提交
804
			    !ieee80211_has_fromds(hdr->frame_control))
805
				return RX_DROP_MONITOR;
806
			if (ether_addr_equal(hdr->addr3, dev_addr))
807 808 809 810
				return RX_DROP_MONITOR;
		} else {
			if (!ieee80211_has_a4(hdr->frame_control))
				return RX_DROP_MONITOR;
811
			if (ether_addr_equal(hdr->addr4, dev_addr))
812 813
				return RX_DROP_MONITOR;
		}
814 815 816 817 818 819
	}

	/* If there is not an established peer link and this is not a peer link
	 * establisment frame, beacon or probe, drop the frame.
	 */

820
	if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
821
		struct ieee80211_mgmt *mgmt;
822

823
		if (!ieee80211_is_mgmt(hdr->frame_control))
824 825
			return RX_DROP_MONITOR;

826
		if (ieee80211_is_action(hdr->frame_control)) {
827
			u8 category;
828 829 830 831 832

			/* make sure category field is present */
			if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
				return RX_DROP_MONITOR;

833
			mgmt = (struct ieee80211_mgmt *)hdr;
834 835
			category = mgmt->u.action.category;
			if (category != WLAN_CATEGORY_MESH_ACTION &&
J
Johannes Berg 已提交
836
			    category != WLAN_CATEGORY_SELF_PROTECTED)
837 838 839 840
				return RX_DROP_MONITOR;
			return RX_CONTINUE;
		}

841 842
		if (ieee80211_is_probe_req(hdr->frame_control) ||
		    ieee80211_is_probe_resp(hdr->frame_control) ||
843 844
		    ieee80211_is_beacon(hdr->frame_control) ||
		    ieee80211_is_auth(hdr->frame_control))
845 846 847 848 849
			return RX_CONTINUE;

		return RX_DROP_MONITOR;
	}

J
Johannes Berg 已提交
850 851
	return RX_CONTINUE;
}
852

853 854 855 856 857 858 859
static inline bool ieee80211_rx_reorder_ready(struct tid_ampdu_rx *tid_agg_rx,
					      int index)
{
	struct sk_buff_head *frames = &tid_agg_rx->reorder_buf[index];
	struct sk_buff *tail = skb_peek_tail(frames);
	struct ieee80211_rx_status *status;

860 861 862
	if (tid_agg_rx->reorder_buf_filtered & BIT_ULL(index))
		return true;

863 864 865 866 867 868 869 870 871 872
	if (!tail)
		return false;

	status = IEEE80211_SKB_RXCB(tail);
	if (status->flag & RX_FLAG_AMSDU_MORE)
		return false;

	return true;
}

873
static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
874
					    struct tid_ampdu_rx *tid_agg_rx,
875 876
					    int index,
					    struct sk_buff_head *frames)
877
{
878 879
	struct sk_buff_head *skb_list = &tid_agg_rx->reorder_buf[index];
	struct sk_buff *skb;
880
	struct ieee80211_rx_status *status;
881

882 883
	lockdep_assert_held(&tid_agg_rx->reorder_lock);

884
	if (skb_queue_empty(skb_list))
885 886
		goto no_frame;

887
	if (!ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
888 889 890 891 892
		__skb_queue_purge(skb_list);
		goto no_frame;
	}

	/* release frames from the reorder ring buffer */
893
	tid_agg_rx->stored_mpdu_num--;
894 895 896 897 898
	while ((skb = __skb_dequeue(skb_list))) {
		status = IEEE80211_SKB_RXCB(skb);
		status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
		__skb_queue_tail(frames, skb);
	}
899 900

no_frame:
901
	tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
902
	tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num);
903 904
}

905
static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
906
					     struct tid_ampdu_rx *tid_agg_rx,
907 908
					     u16 head_seq_num,
					     struct sk_buff_head *frames)
909 910 911
{
	int index;

912 913
	lockdep_assert_held(&tid_agg_rx->reorder_lock);

914
	while (ieee80211_sn_less(tid_agg_rx->head_seq_num, head_seq_num)) {
915
		index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
916 917
		ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
						frames);
918 919 920 921 922 923 924 925 926
	}
}

/*
 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
 * the skb was added to the buffer longer than this time ago, the earlier
 * frames that have not yet been received are assumed to be lost and the skb
 * can be released for processing. This may also release other skb's from the
 * reorder buffer if there are no additional gaps between the frames.
927 928
 *
 * Callers must hold tid_agg_rx->reorder_lock.
929 930 931
 */
#define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)

932
static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
933 934
					  struct tid_ampdu_rx *tid_agg_rx,
					  struct sk_buff_head *frames)
935
{
936
	int index, i, j;
937

938 939
	lockdep_assert_held(&tid_agg_rx->reorder_lock);

940
	/* release the buffer until next missing frame */
941
	index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
942
	if (!ieee80211_rx_reorder_ready(tid_agg_rx, index) &&
943
	    tid_agg_rx->stored_mpdu_num) {
944 945 946 947 948 949 950
		/*
		 * No buffers ready to be released, but check whether any
		 * frames in the reorder buffer have timed out.
		 */
		int skipped = 1;
		for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
		     j = (j + 1) % tid_agg_rx->buf_size) {
951
			if (!ieee80211_rx_reorder_ready(tid_agg_rx, j)) {
952 953 954
				skipped++;
				continue;
			}
955 956
			if (skipped &&
			    !time_after(jiffies, tid_agg_rx->reorder_time[j] +
957
					HT_RX_REORDER_BUF_TIMEOUT))
958
				goto set_release_timer;
959

960 961 962 963 964
			/* don't leave incomplete A-MSDUs around */
			for (i = (index + 1) % tid_agg_rx->buf_size; i != j;
			     i = (i + 1) % tid_agg_rx->buf_size)
				__skb_queue_purge(&tid_agg_rx->reorder_buf[i]);

J
Johannes Berg 已提交
965 966
			ht_dbg_ratelimited(sdata,
					   "release an RX reorder frame due to timeout on earlier frames\n");
967 968
			ieee80211_release_reorder_frame(sdata, tid_agg_rx, j,
							frames);
969 970 971 972 973

			/*
			 * Increment the head seq# also for the skipped slots.
			 */
			tid_agg_rx->head_seq_num =
974 975
				(tid_agg_rx->head_seq_num +
				 skipped) & IEEE80211_SN_MASK;
976 977
			skipped = 0;
		}
978
	} else while (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
979 980
		ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
						frames);
981
		index =	tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
982
	}
983 984

	if (tid_agg_rx->stored_mpdu_num) {
985
		j = index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
986 987 988

		for (; j != (index - 1) % tid_agg_rx->buf_size;
		     j = (j + 1) % tid_agg_rx->buf_size) {
989
			if (ieee80211_rx_reorder_ready(tid_agg_rx, j))
990 991 992 993 994
				break;
		}

 set_release_timer:

995 996 997 998
		if (!tid_agg_rx->removed)
			mod_timer(&tid_agg_rx->reorder_timer,
				  tid_agg_rx->reorder_time[j] + 1 +
				  HT_RX_REORDER_BUF_TIMEOUT);
999 1000 1001
	} else {
		del_timer(&tid_agg_rx->reorder_timer);
	}
1002 1003
}

1004 1005 1006 1007 1008
/*
 * As this function belongs to the RX path it must be under
 * rcu_read_lock protection. It returns false if the frame
 * can be processed immediately, true if it was consumed.
 */
1009
static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
1010
					     struct tid_ampdu_rx *tid_agg_rx,
1011 1012
					     struct sk_buff *skb,
					     struct sk_buff_head *frames)
1013 1014
{
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1015
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1016 1017 1018 1019
	u16 sc = le16_to_cpu(hdr->seq_ctrl);
	u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
	u16 head_seq_num, buf_size;
	int index;
1020
	bool ret = true;
1021

1022 1023
	spin_lock(&tid_agg_rx->reorder_lock);

1024 1025 1026 1027 1028 1029 1030 1031 1032 1033
	/*
	 * Offloaded BA sessions have no known starting sequence number so pick
	 * one from first Rxed frame for this tid after BA was started.
	 */
	if (unlikely(tid_agg_rx->auto_seq)) {
		tid_agg_rx->auto_seq = false;
		tid_agg_rx->ssn = mpdu_seq_num;
		tid_agg_rx->head_seq_num = mpdu_seq_num;
	}

1034 1035 1036 1037
	buf_size = tid_agg_rx->buf_size;
	head_seq_num = tid_agg_rx->head_seq_num;

	/* frame with out of date sequence number */
1038
	if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
1039
		dev_kfree_skb(skb);
1040
		goto out;
1041 1042 1043 1044 1045 1046
	}

	/*
	 * If frame the sequence number exceeds our buffering window
	 * size release some previous frames to make room for this one.
	 */
1047 1048 1049
	if (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) {
		head_seq_num = ieee80211_sn_inc(
				ieee80211_sn_sub(mpdu_seq_num, buf_size));
1050
		/* release stored frames up to new head to stack */
1051
		ieee80211_release_reorder_frames(sdata, tid_agg_rx,
1052
						 head_seq_num, frames);
1053 1054 1055 1056
	}

	/* Now the new frame is always in the range of the reordering buffer */

1057
	index = mpdu_seq_num % tid_agg_rx->buf_size;
1058 1059

	/* check if we already stored this frame */
1060
	if (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1061
		dev_kfree_skb(skb);
1062
		goto out;
1063 1064 1065 1066 1067
	}

	/*
	 * If the current MPDU is in the right order and nothing else
	 * is stored we can process it directly, no need to buffer it.
1068 1069
	 * If it is first but there's something stored, we may be able
	 * to release frames after this one.
1070 1071 1072
	 */
	if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
	    tid_agg_rx->stored_mpdu_num == 0) {
1073 1074 1075
		if (!(status->flag & RX_FLAG_AMSDU_MORE))
			tid_agg_rx->head_seq_num =
				ieee80211_sn_inc(tid_agg_rx->head_seq_num);
1076 1077
		ret = false;
		goto out;
1078 1079 1080
	}

	/* put the frame in the reordering buffer */
1081 1082 1083 1084 1085 1086
	__skb_queue_tail(&tid_agg_rx->reorder_buf[index], skb);
	if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
		tid_agg_rx->reorder_time[index] = jiffies;
		tid_agg_rx->stored_mpdu_num++;
		ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames);
	}
1087

1088 1089 1090
 out:
	spin_unlock(&tid_agg_rx->reorder_lock);
	return ret;
1091 1092 1093 1094 1095 1096
}

/*
 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
 * true if the MPDU was buffered, false if it should be processed.
 */
1097 1098
static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
				       struct sk_buff_head *frames)
1099
{
1100 1101
	struct sk_buff *skb = rx->skb;
	struct ieee80211_local *local = rx->local;
1102
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1103
	struct sta_info *sta = rx->sta;
1104 1105
	struct tid_ampdu_rx *tid_agg_rx;
	u16 sc;
1106
	u8 tid, ack_policy;
1107

1108 1109
	if (!ieee80211_is_data_qos(hdr->frame_control) ||
	    is_multicast_ether_addr(hdr->addr1))
1110
		goto dont_reorder;
1111 1112 1113 1114 1115 1116 1117

	/*
	 * filter the QoS data rx stream according to
	 * STA/TID and check if this STA/TID is on aggregation
	 */

	if (!sta)
1118
		goto dont_reorder;
1119

1120 1121
	ack_policy = *ieee80211_get_qos_ctl(hdr) &
		     IEEE80211_QOS_CTL_ACK_POLICY_MASK;
1122 1123
	tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;

1124
	tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
1125 1126 1127 1128 1129 1130 1131
	if (!tid_agg_rx) {
		if (ack_policy == IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
		    !test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
		    !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg))
			ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid,
					     WLAN_BACK_RECIPIENT,
					     WLAN_REASON_QSTA_REQUIRE_SETUP);
1132
		goto dont_reorder;
1133
	}
1134 1135 1136

	/* qos null data frames are excluded */
	if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
1137
		goto dont_reorder;
1138

1139 1140 1141 1142 1143
	/* not part of a BA session */
	if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
	    ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
		goto dont_reorder;

1144 1145 1146 1147
	/* new, potentially un-ordered, ampdu frame - process it */

	/* reset session timer */
	if (tid_agg_rx->timeout)
1148
		tid_agg_rx->last_rx = jiffies;
1149 1150 1151 1152

	/* if this mpdu is fragmented - terminate rx aggregation session */
	sc = le16_to_cpu(hdr->seq_ctrl);
	if (sc & IEEE80211_SCTL_FRAG) {
1153
		skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
1154 1155
		skb_queue_tail(&rx->sdata->skb_queue, skb);
		ieee80211_queue_work(&local->hw, &rx->sdata->work);
1156
		return;
1157 1158
	}

1159 1160 1161 1162 1163 1164 1165
	/*
	 * No locking needed -- we will only ever process one
	 * RX packet at a time, and thus own tid_agg_rx. All
	 * other code manipulating it needs to (and does) make
	 * sure that we cannot get to it any more before doing
	 * anything with it.
	 */
1166 1167
	if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb,
					     frames))
1168 1169 1170
		return;

 dont_reorder:
1171
	__skb_queue_tail(frames, skb);
1172
}
1173

1174
static ieee80211_rx_result debug_noinline
1175
ieee80211_rx_h_check_dup(struct ieee80211_rx_data *rx)
1176
{
1177
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1178
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1179

1180 1181 1182
	if (status->flag & RX_FLAG_DUP_VALIDATED)
		return RX_CONTINUE;

1183 1184 1185 1186
	/*
	 * Drop duplicate 802.11 retransmissions
	 * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
	 */
1187 1188 1189 1190 1191 1192 1193 1194 1195

	if (rx->skb->len < 24)
		return RX_CONTINUE;

	if (ieee80211_is_ctl(hdr->frame_control) ||
	    ieee80211_is_qos_nullfunc(hdr->frame_control) ||
	    is_multicast_ether_addr(hdr->addr1))
		return RX_CONTINUE;

1196 1197 1198 1199 1200 1201
	if (!rx->sta)
		return RX_CONTINUE;

	if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
		     rx->sta->last_seq_ctrl[rx->seqno_idx] == hdr->seq_ctrl)) {
		I802_DEBUG_INC(rx->local->dot11FrameDuplicateCount);
1202
		rx->sta->rx_stats.num_duplicates++;
1203 1204 1205
		return RX_DROP_UNUSABLE;
	} else if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
		rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
1206 1207
	}

1208 1209 1210 1211 1212 1213 1214 1215
	return RX_CONTINUE;
}

static ieee80211_rx_result debug_noinline
ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
{
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;

1216 1217 1218
	/* Drop disallowed frame classes based on STA auth/assoc state;
	 * IEEE 802.11, Chap 5.5.
	 *
J
Johannes Berg 已提交
1219 1220
	 * mac80211 filters only based on association state, i.e. it drops
	 * Class 3 frames from not associated stations. hostapd sends
1221 1222 1223
	 * deauth/disassoc frames when needed. In addition, hostapd is
	 * responsible for filtering on both auth and assoc states.
	 */
1224

J
Johannes Berg 已提交
1225
	if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1226 1227
		return ieee80211_rx_mesh_check(rx);

1228 1229
	if (unlikely((ieee80211_is_data(hdr->frame_control) ||
		      ieee80211_is_pspoll(hdr->frame_control)) &&
1230
		     rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
B
Bill Jordan 已提交
1231
		     rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
1232
		     rx->sdata->vif.type != NL80211_IFTYPE_OCB &&
J
Johannes Berg 已提交
1233
		     (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
1234 1235 1236 1237 1238 1239
		/*
		 * accept port control frames from the AP even when it's not
		 * yet marked ASSOC to prevent a race where we don't set the
		 * assoc bit quickly enough before it sends the first frame
		 */
		if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1240
		    ieee80211_is_data_present(hdr->frame_control)) {
1241 1242 1243 1244 1245 1246 1247 1248 1249 1250
			unsigned int hdrlen;
			__be16 ethertype;

			hdrlen = ieee80211_hdrlen(hdr->frame_control);

			if (rx->skb->len < hdrlen + 8)
				return RX_DROP_MONITOR;

			skb_copy_bits(rx->skb, hdrlen + 6, &ethertype, 2);
			if (ethertype == rx->sdata->control_port_protocol)
1251 1252
				return RX_CONTINUE;
		}
1253 1254 1255 1256 1257 1258 1259

		if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
		    cfg80211_rx_spurious_frame(rx->sdata->dev,
					       hdr->addr2,
					       GFP_ATOMIC))
			return RX_DROP_UNUSABLE;

J
Johannes Berg 已提交
1260
		return RX_DROP_MONITOR;
1261
	}
1262

1263
	return RX_CONTINUE;
1264 1265 1266
}


1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299
static ieee80211_rx_result debug_noinline
ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
{
	struct ieee80211_local *local;
	struct ieee80211_hdr *hdr;
	struct sk_buff *skb;

	local = rx->local;
	skb = rx->skb;
	hdr = (struct ieee80211_hdr *) skb->data;

	if (!local->pspolling)
		return RX_CONTINUE;

	if (!ieee80211_has_fromds(hdr->frame_control))
		/* this is not from AP */
		return RX_CONTINUE;

	if (!ieee80211_is_data(hdr->frame_control))
		return RX_CONTINUE;

	if (!ieee80211_has_moredata(hdr->frame_control)) {
		/* AP has no more frames buffered for us */
		local->pspolling = false;
		return RX_CONTINUE;
	}

	/* more data bit is set, let's request a new frame from the AP */
	ieee80211_send_pspoll(local, rx->sdata);

	return RX_CONTINUE;
}

1300
static void sta_ps_start(struct sta_info *sta)
1301
{
1302
	struct ieee80211_sub_if_data *sdata = sta->sdata;
1303
	struct ieee80211_local *local = sdata->local;
1304
	struct ps_data *ps;
1305
	int tid;
1306

1307 1308 1309 1310 1311 1312 1313
	if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
	    sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
		ps = &sdata->bss->ps;
	else
		return;

	atomic_inc(&ps->num_sta_ps);
J
Johannes Berg 已提交
1314
	set_sta_flag(sta, WLAN_STA_PS_STA);
1315
	if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
1316
		drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
J
Johannes Berg 已提交
1317 1318
	ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
	       sta->sta.addr, sta->sta.aid);
1319

J
Johannes Berg 已提交
1320 1321
	ieee80211_clear_fast_xmit(sta);

1322 1323 1324 1325
	if (!sta->sta.txq[0])
		return;

	for (tid = 0; tid < ARRAY_SIZE(sta->sta.txq); tid++) {
1326
		if (txq_has_queue(sta->sta.txq[tid]))
1327 1328 1329 1330
			set_bit(tid, &sta->txq_buffered_tids);
		else
			clear_bit(tid, &sta->txq_buffered_tids);
	}
1331 1332
}

1333
static void sta_ps_end(struct sta_info *sta)
1334
{
J
Johannes Berg 已提交
1335 1336
	ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
	       sta->sta.addr, sta->sta.aid);
1337

J
Johannes Berg 已提交
1338
	if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
1339 1340 1341 1342 1343 1344 1345
		/*
		 * Clear the flag only if the other one is still set
		 * so that the TX path won't start TX'ing new frames
		 * directly ... In the case that the driver flag isn't
		 * set ieee80211_sta_ps_deliver_wakeup() will clear it.
		 */
		clear_sta_flag(sta, WLAN_STA_PS_STA);
J
Johannes Berg 已提交
1346 1347
		ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
		       sta->sta.addr, sta->sta.aid);
1348 1349 1350
		return;
	}

1351 1352
	set_sta_flag(sta, WLAN_STA_PS_DELIVER);
	clear_sta_flag(sta, WLAN_STA_PS_STA);
1353
	ieee80211_sta_ps_deliver_wakeup(sta);
1354 1355
}

1356
int ieee80211_sta_ps_transition(struct ieee80211_sta *pubsta, bool start)
1357
{
1358
	struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1359 1360
	bool in_ps;

1361
	WARN_ON(!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS));
1362 1363

	/* Don't let the same PS state be set twice */
1364
	in_ps = test_sta_flag(sta, WLAN_STA_PS_STA);
1365 1366 1367 1368
	if ((start && in_ps) || (!start && !in_ps))
		return -EINVAL;

	if (start)
1369
		sta_ps_start(sta);
1370
	else
1371
		sta_ps_end(sta);
1372 1373 1374 1375 1376

	return 0;
}
EXPORT_SYMBOL(ieee80211_sta_ps_transition);

1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396
void ieee80211_sta_pspoll(struct ieee80211_sta *pubsta)
{
	struct sta_info *sta = container_of(pubsta, struct sta_info, sta);

	if (test_sta_flag(sta, WLAN_STA_SP))
		return;

	if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
		ieee80211_sta_ps_deliver_poll_response(sta);
	else
		set_sta_flag(sta, WLAN_STA_PSPOLL);
}
EXPORT_SYMBOL(ieee80211_sta_pspoll);

void ieee80211_sta_uapsd_trigger(struct ieee80211_sta *pubsta, u8 tid)
{
	struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
	u8 ac = ieee802_1d_to_ac[tid & 7];

	/*
1397 1398
	 * If this AC is not trigger-enabled do nothing unless the
	 * driver is calling us after it already checked.
1399 1400 1401 1402 1403
	 *
	 * NB: This could/should check a separate bitmap of trigger-
	 * enabled queues, but for now we only implement uAPSD w/o
	 * TSPEC changes to the ACs, so they're always the same.
	 */
1404 1405
	if (!(sta->sta.uapsd_queues & ieee80211_ac_to_qos_mask[ac]) &&
	    tid != IEEE80211_NUM_TIDS)
1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418
		return;

	/* if we are in a service period, do nothing */
	if (test_sta_flag(sta, WLAN_STA_SP))
		return;

	if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
		ieee80211_sta_ps_deliver_uapsd(sta);
	else
		set_sta_flag(sta, WLAN_STA_UAPSD);
}
EXPORT_SYMBOL(ieee80211_sta_uapsd_trigger);

J
Johannes Berg 已提交
1419 1420 1421 1422 1423 1424 1425
static ieee80211_rx_result debug_noinline
ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
{
	struct ieee80211_sub_if_data *sdata = rx->sdata;
	struct ieee80211_hdr *hdr = (void *)rx->skb->data;
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);

1426
	if (!rx->sta)
J
Johannes Berg 已提交
1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437
		return RX_CONTINUE;

	if (sdata->vif.type != NL80211_IFTYPE_AP &&
	    sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
		return RX_CONTINUE;

	/*
	 * The device handles station powersave, so don't do anything about
	 * uAPSD and PS-Poll frames (the latter shouldn't even come up from
	 * it to mac80211 since they're handled.)
	 */
1438
	if (ieee80211_hw_check(&sdata->local->hw, AP_LINK_PS))
J
Johannes Berg 已提交
1439 1440 1441 1442 1443 1444 1445
		return RX_CONTINUE;

	/*
	 * Don't do anything if the station isn't already asleep. In
	 * the uAPSD case, the station will probably be marked asleep,
	 * in the PS-Poll case the station must be confused ...
	 */
J
Johannes Berg 已提交
1446
	if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
J
Johannes Berg 已提交
1447 1448 1449
		return RX_CONTINUE;

	if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
1450
		ieee80211_sta_pspoll(&rx->sta->sta);
J
Johannes Berg 已提交
1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461

		/* Free PS Poll skb here instead of returning RX_DROP that would
		 * count as an dropped frame. */
		dev_kfree_skb(rx->skb);

		return RX_QUEUED;
	} else if (!ieee80211_has_morefrags(hdr->frame_control) &&
		   !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
		   ieee80211_has_pm(hdr->frame_control) &&
		   (ieee80211_is_data_qos(hdr->frame_control) ||
		    ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1462
		u8 tid;
J
Johannes Berg 已提交
1463

1464
		tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
J
Johannes Berg 已提交
1465

1466
		ieee80211_sta_uapsd_trigger(&rx->sta->sta, tid);
J
Johannes Berg 已提交
1467 1468 1469 1470 1471
	}

	return RX_CONTINUE;
}

1472
static ieee80211_rx_result debug_noinline
1473
ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1474 1475
{
	struct sta_info *sta = rx->sta;
J
Johannes Berg 已提交
1476 1477 1478
	struct sk_buff *skb = rx->skb;
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1479
	int i;
1480 1481

	if (!sta)
1482
		return RX_CONTINUE;
1483

J
Johannes Berg 已提交
1484 1485
	/*
	 * Update last_rx only for IBSS packets which are for the current
1486 1487 1488 1489 1490
	 * BSSID and for station already AUTHORIZED to avoid keeping the
	 * current IBSS network alive in cases where other STAs start
	 * using different BSSID. This will also give the station another
	 * chance to restart the authentication/authorization in case
	 * something went wrong the first time.
J
Johannes Berg 已提交
1491
	 */
1492
	if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1493
		u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1494
						NL80211_IFTYPE_ADHOC);
1495 1496
		if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
		    test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
1497
			sta->rx_stats.last_rx = jiffies;
1498
			if (ieee80211_is_data(hdr->frame_control) &&
1499 1500 1501
			    !is_multicast_ether_addr(hdr->addr1))
				sta->rx_stats.last_rate =
					sta_stats_encode_rate(status);
1502
		}
1503
	} else if (rx->sdata->vif.type == NL80211_IFTYPE_OCB) {
1504
		sta->rx_stats.last_rx = jiffies;
J
Johannes Berg 已提交
1505 1506
	} else if (!is_multicast_ether_addr(hdr->addr1)) {
		/*
1507 1508
		 * Mesh beacons will update last_rx when if they are found to
		 * match the current local configuration when processed.
1509
		 */
1510
		sta->rx_stats.last_rx = jiffies;
1511 1512
		if (ieee80211_is_data(hdr->frame_control))
			sta->rx_stats.last_rate = sta_stats_encode_rate(status);
1513 1514
	}

1515 1516 1517
	if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
		ieee80211_sta_rx_notify(rx->sdata, hdr);

1518
	sta->rx_stats.fragments++;
1519 1520

	u64_stats_update_begin(&rx->sta->rx_stats.syncp);
1521
	sta->rx_stats.bytes += rx->skb->len;
1522 1523
	u64_stats_update_end(&rx->sta->rx_stats.syncp);

1524
	if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1525
		sta->rx_stats.last_signal = status->signal;
1526
		ewma_signal_add(&sta->rx_stats_avg.signal, -status->signal);
1527
	}
1528

1529
	if (status->chains) {
1530
		sta->rx_stats.chains = status->chains;
1531 1532 1533 1534 1535 1536
		for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
			int signal = status->chain_signal[i];

			if (!(status->chains & BIT(i)))
				continue;

1537
			sta->rx_stats.chain_signal_last[i] = signal;
1538
			ewma_signal_add(&sta->rx_stats_avg.chain_signal[i],
1539
					-signal);
1540 1541 1542
		}
	}

1543 1544 1545 1546
	/*
	 * Change STA power saving mode only at the end of a frame
	 * exchange sequence.
	 */
1547
	if (!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS) &&
1548
	    !ieee80211_has_morefrags(hdr->frame_control) &&
1549
	    !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1550
	    (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1551 1552 1553 1554 1555 1556 1557
	     rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
	    /* PM bit is only checked in frames where it isn't reserved,
	     * in AP mode it's reserved in non-bufferable management frames
	     * (cf. IEEE 802.11-2012 8.2.4.1.7 Power Management field)
	     */
	    (!ieee80211_is_mgmt(hdr->frame_control) ||
	     ieee80211_is_bufferable_mmpdu(hdr->frame_control))) {
J
Johannes Berg 已提交
1558
		if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1559
			if (!ieee80211_has_pm(hdr->frame_control))
1560
				sta_ps_end(sta);
1561 1562
		} else {
			if (ieee80211_has_pm(hdr->frame_control))
1563
				sta_ps_start(sta);
1564
		}
1565 1566
	}

M
Marco Porsch 已提交
1567 1568 1569 1570
	/* mesh power save support */
	if (ieee80211_vif_is_mesh(&rx->sdata->vif))
		ieee80211_mps_rx_h_sta_process(sta, hdr);

1571 1572 1573 1574 1575 1576
	/*
	 * Drop (qos-)data::nullfunc frames silently, since they
	 * are used only to control station power saving mode.
	 */
	if (ieee80211_is_nullfunc(hdr->frame_control) ||
	    ieee80211_is_qos_nullfunc(hdr->frame_control)) {
1577
		I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1578 1579 1580

		/*
		 * If we receive a 4-addr nullfunc frame from a STA
1581 1582 1583
		 * that was not moved to a 4-addr STA vlan yet send
		 * the event to userspace and for older hostapd drop
		 * the frame to the monitor interface.
1584 1585 1586 1587
		 */
		if (ieee80211_has_a4(hdr->frame_control) &&
		    (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
		     (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1588 1589 1590 1591 1592
		      !rx->sdata->u.vlan.sta))) {
			if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
				cfg80211_rx_unexpected_4addr_frame(
					rx->sdata->dev, sta->sta.addr,
					GFP_ATOMIC);
1593
			return RX_DROP_MONITOR;
1594
		}
1595 1596 1597 1598
		/*
		 * Update counter and free packet here to avoid
		 * counting this as a dropped packed.
		 */
1599
		sta->rx_stats.packets++;
1600
		dev_kfree_skb(rx->skb);
1601
		return RX_QUEUED;
1602 1603
	}

1604
	return RX_CONTINUE;
1605 1606
} /* ieee80211_rx_h_sta_process */

1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618
static ieee80211_rx_result debug_noinline
ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
{
	struct sk_buff *skb = rx->skb;
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
	int keyidx;
	int hdrlen;
	ieee80211_rx_result result = RX_DROP_UNUSABLE;
	struct ieee80211_key *sta_ptk = NULL;
	int mmie_keyidx = -1;
	__le16 fc;
1619
	const struct ieee80211_cipher_scheme *cs = NULL;
1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649

	/*
	 * Key selection 101
	 *
	 * There are four types of keys:
	 *  - GTK (group keys)
	 *  - IGTK (group keys for management frames)
	 *  - PTK (pairwise keys)
	 *  - STK (station-to-station pairwise keys)
	 *
	 * When selecting a key, we have to distinguish between multicast
	 * (including broadcast) and unicast frames, the latter can only
	 * use PTKs and STKs while the former always use GTKs and IGTKs.
	 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
	 * unicast frames can also use key indices like GTKs. Hence, if we
	 * don't have a PTK/STK we check the key index for a WEP key.
	 *
	 * Note that in a regular BSS, multicast frames are sent by the
	 * AP only, associated stations unicast the frame to the AP first
	 * which then multicasts it on their behalf.
	 *
	 * There is also a slight problem in IBSS mode: GTKs are negotiated
	 * with each station, that is something we don't currently handle.
	 * The spec seems to expect that one negotiates the same key with
	 * every station but there's no such requirement; VLANs could be
	 * possible.
	 */

	/* start without a key */
	rx->key = NULL;
1650
	fc = hdr->frame_control;
1651

1652 1653
	if (rx->sta) {
		int keyid = rx->sta->ptk_idx;
1654

1655 1656
		if (ieee80211_has_protected(fc) && rx->sta->cipher_scheme) {
			cs = rx->sta->cipher_scheme;
1657
			keyid = ieee80211_get_cs_keyid(cs, rx->skb);
1658 1659 1660 1661 1662
			if (unlikely(keyid < 0))
				return RX_DROP_UNUSABLE;
		}
		sta_ptk = rcu_dereference(rx->sta->ptk[keyid]);
	}
1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683

	if (!ieee80211_has_protected(fc))
		mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);

	if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
		rx->key = sta_ptk;
		if ((status->flag & RX_FLAG_DECRYPTED) &&
		    (status->flag & RX_FLAG_IV_STRIPPED))
			return RX_CONTINUE;
		/* Skip decryption if the frame is not protected. */
		if (!ieee80211_has_protected(fc))
			return RX_CONTINUE;
	} else if (mmie_keyidx >= 0) {
		/* Broadcast/multicast robust management frame / BIP */
		if ((status->flag & RX_FLAG_DECRYPTED) &&
		    (status->flag & RX_FLAG_IV_STRIPPED))
			return RX_CONTINUE;

		if (mmie_keyidx < NUM_DEFAULT_KEYS ||
		    mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
			return RX_DROP_MONITOR; /* unexpected BIP keyidx */
1684 1685 1686 1687 1688
		if (rx->sta) {
			if (ieee80211_is_group_privacy_action(skb) &&
			    test_sta_flag(rx->sta, WLAN_STA_MFP))
				return RX_DROP_MONITOR;

1689
			rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
1690
		}
1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728
		if (!rx->key)
			rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
	} else if (!ieee80211_has_protected(fc)) {
		/*
		 * The frame was not protected, so skip decryption. However, we
		 * need to set rx->key if there is a key that could have been
		 * used so that the frame may be dropped if encryption would
		 * have been expected.
		 */
		struct ieee80211_key *key = NULL;
		struct ieee80211_sub_if_data *sdata = rx->sdata;
		int i;

		if (ieee80211_is_mgmt(fc) &&
		    is_multicast_ether_addr(hdr->addr1) &&
		    (key = rcu_dereference(rx->sdata->default_mgmt_key)))
			rx->key = key;
		else {
			if (rx->sta) {
				for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
					key = rcu_dereference(rx->sta->gtk[i]);
					if (key)
						break;
				}
			}
			if (!key) {
				for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
					key = rcu_dereference(sdata->keys[i]);
					if (key)
						break;
				}
			}
			if (key)
				rx->key = key;
		}
		return RX_CONTINUE;
	} else {
		u8 keyid;
1729

1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744
		/*
		 * The device doesn't give us the IV so we won't be
		 * able to look up the key. That's ok though, we
		 * don't need to decrypt the frame, we just won't
		 * be able to keep statistics accurate.
		 * Except for key threshold notifications, should
		 * we somehow allow the driver to tell us which key
		 * the hardware used if this flag is set?
		 */
		if ((status->flag & RX_FLAG_DECRYPTED) &&
		    (status->flag & RX_FLAG_IV_STRIPPED))
			return RX_CONTINUE;

		hdrlen = ieee80211_hdrlen(fc);

1745
		if (cs) {
1746
			keyidx = ieee80211_get_cs_keyid(cs, rx->skb);
1747

1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759
			if (unlikely(keyidx < 0))
				return RX_DROP_UNUSABLE;
		} else {
			if (rx->skb->len < 8 + hdrlen)
				return RX_DROP_UNUSABLE; /* TODO: count this? */
			/*
			 * no need to call ieee80211_wep_get_keyidx,
			 * it verifies a bunch of things we've done already
			 */
			skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
			keyidx = keyid >> 6;
		}
1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799

		/* check per-station GTK first, if multicast packet */
		if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
			rx->key = rcu_dereference(rx->sta->gtk[keyidx]);

		/* if not found, try default key */
		if (!rx->key) {
			rx->key = rcu_dereference(rx->sdata->keys[keyidx]);

			/*
			 * RSNA-protected unicast frames should always be
			 * sent with pairwise or station-to-station keys,
			 * but for WEP we allow using a key index as well.
			 */
			if (rx->key &&
			    rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
			    rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
			    !is_multicast_ether_addr(hdr->addr1))
				rx->key = NULL;
		}
	}

	if (rx->key) {
		if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
			return RX_DROP_MONITOR;

		/* TODO: add threshold stuff again */
	} else {
		return RX_DROP_MONITOR;
	}

	switch (rx->key->conf.cipher) {
	case WLAN_CIPHER_SUITE_WEP40:
	case WLAN_CIPHER_SUITE_WEP104:
		result = ieee80211_crypto_wep_decrypt(rx);
		break;
	case WLAN_CIPHER_SUITE_TKIP:
		result = ieee80211_crypto_tkip_decrypt(rx);
		break;
	case WLAN_CIPHER_SUITE_CCMP:
J
Jouni Malinen 已提交
1800 1801 1802 1803 1804 1805
		result = ieee80211_crypto_ccmp_decrypt(
			rx, IEEE80211_CCMP_MIC_LEN);
		break;
	case WLAN_CIPHER_SUITE_CCMP_256:
		result = ieee80211_crypto_ccmp_decrypt(
			rx, IEEE80211_CCMP_256_MIC_LEN);
1806 1807 1808 1809
		break;
	case WLAN_CIPHER_SUITE_AES_CMAC:
		result = ieee80211_crypto_aes_cmac_decrypt(rx);
		break;
1810 1811 1812
	case WLAN_CIPHER_SUITE_BIP_CMAC_256:
		result = ieee80211_crypto_aes_cmac_256_decrypt(rx);
		break;
1813 1814 1815 1816
	case WLAN_CIPHER_SUITE_BIP_GMAC_128:
	case WLAN_CIPHER_SUITE_BIP_GMAC_256:
		result = ieee80211_crypto_aes_gmac_decrypt(rx);
		break;
1817 1818 1819 1820
	case WLAN_CIPHER_SUITE_GCMP:
	case WLAN_CIPHER_SUITE_GCMP_256:
		result = ieee80211_crypto_gcmp_decrypt(rx);
		break;
1821
	default:
1822
		result = ieee80211_crypto_hw_decrypt(rx);
1823 1824 1825 1826 1827 1828 1829 1830 1831 1832
	}

	/* the hdr variable is invalid after the decrypt handlers */

	/* either the frame has been decrypted or will be dropped */
	status->flag |= RX_FLAG_DECRYPTED;

	return result;
}

1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843
static inline struct ieee80211_fragment_entry *
ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
			 unsigned int frag, unsigned int seq, int rx_queue,
			 struct sk_buff **skb)
{
	struct ieee80211_fragment_entry *entry;

	entry = &sdata->fragments[sdata->fragment_next++];
	if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
		sdata->fragment_next = 0;

J
Johannes Berg 已提交
1844
	if (!skb_queue_empty(&entry->skb_list))
1845 1846 1847 1848 1849 1850 1851 1852
		__skb_queue_purge(&entry->skb_list);

	__skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
	*skb = NULL;
	entry->first_frag_time = jiffies;
	entry->seq = seq;
	entry->rx_queue = rx_queue;
	entry->last_frag = frag;
1853
	entry->check_sequential_pn = false;
1854 1855 1856 1857 1858 1859 1860
	entry->extra_len = 0;

	return entry;
}

static inline struct ieee80211_fragment_entry *
ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
1861
			  unsigned int frag, unsigned int seq,
1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880
			  int rx_queue, struct ieee80211_hdr *hdr)
{
	struct ieee80211_fragment_entry *entry;
	int i, idx;

	idx = sdata->fragment_next;
	for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
		struct ieee80211_hdr *f_hdr;

		idx--;
		if (idx < 0)
			idx = IEEE80211_FRAGMENT_MAX - 1;

		entry = &sdata->fragments[idx];
		if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
		    entry->rx_queue != rx_queue ||
		    entry->last_frag + 1 != frag)
			continue;

1881
		f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
1882

1883 1884 1885 1886 1887
		/*
		 * Check ftype and addresses are equal, else check next fragment
		 */
		if (((hdr->frame_control ^ f_hdr->frame_control) &
		     cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
1888 1889
		    !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
		    !ether_addr_equal(hdr->addr2, f_hdr->addr2))
1890 1891
			continue;

1892
		if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
1893 1894 1895 1896 1897 1898 1899 1900 1901
			__skb_queue_purge(&entry->skb_list);
			continue;
		}
		return entry;
	}

	return NULL;
}

1902
static ieee80211_rx_result debug_noinline
1903
ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
1904 1905 1906
{
	struct ieee80211_hdr *hdr;
	u16 sc;
1907
	__le16 fc;
1908 1909 1910
	unsigned int frag, seq;
	struct ieee80211_fragment_entry *entry;
	struct sk_buff *skb;
1911
	struct ieee80211_rx_status *status;
1912

1913
	hdr = (struct ieee80211_hdr *)rx->skb->data;
1914
	fc = hdr->frame_control;
1915 1916 1917 1918

	if (ieee80211_is_ctl(fc))
		return RX_CONTINUE;

1919 1920 1921
	sc = le16_to_cpu(hdr->seq_ctrl);
	frag = sc & IEEE80211_SCTL_FRAG;

1922
	if (is_multicast_ether_addr(hdr->addr1)) {
1923
		I802_DEBUG_INC(rx->local->dot11MulticastReceivedFrameCount);
1924
		goto out_no_led;
1925
	}
1926

1927 1928 1929
	if (likely(!ieee80211_has_morefrags(fc) && frag == 0))
		goto out;

1930 1931
	I802_DEBUG_INC(rx->local->rx_handlers_fragments);

Z
Zhu Yi 已提交
1932 1933 1934
	if (skb_linearize(rx->skb))
		return RX_DROP_UNUSABLE;

1935 1936 1937 1938 1939 1940
	/*
	 *  skb_linearize() might change the skb->data and
	 *  previously cached variables (in this case, hdr) need to
	 *  be refreshed with the new data.
	 */
	hdr = (struct ieee80211_hdr *)rx->skb->data;
1941 1942 1943 1944 1945
	seq = (sc & IEEE80211_SCTL_SEQ) >> 4;

	if (frag == 0) {
		/* This is the first fragment of a new frame. */
		entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
1946
						 rx->seqno_idx, &(rx->skb));
J
Jouni Malinen 已提交
1947 1948
		if (rx->key &&
		    (rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP ||
1949 1950 1951
		     rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP_256 ||
		     rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP ||
		     rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP_256) &&
1952
		    ieee80211_has_protected(fc)) {
1953
			int queue = rx->security_idx;
1954 1955 1956 1957 1958

			/* Store CCMP/GCMP PN so that we can verify that the
			 * next fragment has a sequential PN value.
			 */
			entry->check_sequential_pn = true;
1959
			memcpy(entry->last_pn,
1960
			       rx->key->u.ccmp.rx_pn[queue],
1961
			       IEEE80211_CCMP_PN_LEN);
1962 1963 1964 1965 1966 1967 1968 1969
			BUILD_BUG_ON(offsetof(struct ieee80211_key,
					      u.ccmp.rx_pn) !=
				     offsetof(struct ieee80211_key,
					      u.gcmp.rx_pn));
			BUILD_BUG_ON(sizeof(rx->key->u.ccmp.rx_pn[queue]) !=
				     sizeof(rx->key->u.gcmp.rx_pn[queue]));
			BUILD_BUG_ON(IEEE80211_CCMP_PN_LEN !=
				     IEEE80211_GCMP_PN_LEN);
1970
		}
1971
		return RX_QUEUED;
1972 1973 1974 1975 1976
	}

	/* This is a fragment for a frame that should already be pending in
	 * fragment cache. Add this fragment to the end of the pending entry.
	 */
1977 1978
	entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
					  rx->seqno_idx, hdr);
1979 1980
	if (!entry) {
		I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
J
Johannes Berg 已提交
1981
		return RX_DROP_MONITOR;
1982 1983
	}

1984 1985 1986 1987 1988 1989
	/* "The receiver shall discard MSDUs and MMPDUs whose constituent
	 *  MPDU PN values are not incrementing in steps of 1."
	 * see IEEE P802.11-REVmc/D5.0, 12.5.3.4.4, item d (for CCMP)
	 * and IEEE P802.11-REVmc/D5.0, 12.5.5.4.4, item d (for GCMP)
	 */
	if (entry->check_sequential_pn) {
1990
		int i;
1991
		u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
1992
		int queue;
1993

J
Jouni Malinen 已提交
1994 1995
		if (!rx->key ||
		    (rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP &&
1996 1997 1998
		     rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP_256 &&
		     rx->key->conf.cipher != WLAN_CIPHER_SUITE_GCMP &&
		     rx->key->conf.cipher != WLAN_CIPHER_SUITE_GCMP_256))
J
Johannes Berg 已提交
1999
			return RX_DROP_UNUSABLE;
2000 2001
		memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
		for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
2002 2003 2004 2005
			pn[i]++;
			if (pn[i])
				break;
		}
2006
		queue = rx->security_idx;
2007
		rpn = rx->key->u.ccmp.rx_pn[queue];
2008
		if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN))
J
Johannes Berg 已提交
2009
			return RX_DROP_UNUSABLE;
2010
		memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN);
2011 2012
	}

2013
	skb_pull(rx->skb, ieee80211_hdrlen(fc));
2014 2015 2016
	__skb_queue_tail(&entry->skb_list, rx->skb);
	entry->last_frag = frag;
	entry->extra_len += rx->skb->len;
2017
	if (ieee80211_has_morefrags(fc)) {
2018
		rx->skb = NULL;
2019
		return RX_QUEUED;
2020 2021 2022 2023
	}

	rx->skb = __skb_dequeue(&entry->skb_list);
	if (skb_tailroom(rx->skb) < entry->extra_len) {
2024
		I802_DEBUG_INC(rx->local->rx_expand_skb_head_defrag);
2025 2026 2027 2028
		if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
					      GFP_ATOMIC))) {
			I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
			__skb_queue_purge(&entry->skb_list);
J
Johannes Berg 已提交
2029
			return RX_DROP_UNUSABLE;
2030 2031 2032 2033 2034 2035 2036 2037
		}
	}
	while ((skb = __skb_dequeue(&entry->skb_list))) {
		memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
		dev_kfree_skb(skb);
	}

	/* Complete frame has been reassembled - process it now */
2038
	status = IEEE80211_SKB_RXCB(rx->skb);
2039 2040

 out:
2041 2042
	ieee80211_led_rx(rx->local);
 out_no_led:
2043
	if (rx->sta)
2044
		rx->sta->rx_stats.packets++;
2045
	return RX_CONTINUE;
2046 2047
}

J
Johannes Berg 已提交
2048
static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
2049
{
J
Johannes Berg 已提交
2050
	if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
2051
		return -EACCES;
2052

2053
	return 0;
2054 2055
}

J
Johannes Berg 已提交
2056
static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
2057
{
J
Johannes Berg 已提交
2058 2059 2060
	struct sk_buff *skb = rx->skb;
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);

2061
	/*
2062 2063
	 * Pass through unencrypted frames if the hardware has
	 * decrypted them already.
2064
	 */
J
Johannes Berg 已提交
2065
	if (status->flag & RX_FLAG_DECRYPTED)
2066
		return 0;
2067 2068

	/* Drop unencrypted frames if key is set. */
2069 2070
	if (unlikely(!ieee80211_has_protected(fc) &&
		     !ieee80211_is_nullfunc(fc) &&
2071
		     ieee80211_is_data(fc) && rx->key))
2072
		return -EACCES;
2073 2074 2075 2076

	return 0;
}

J
Johannes Berg 已提交
2077
static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
2078 2079
{
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2080
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2081 2082
	__le16 fc = hdr->frame_control;

2083 2084 2085 2086 2087 2088
	/*
	 * Pass through unencrypted frames if the hardware has
	 * decrypted them already.
	 */
	if (status->flag & RX_FLAG_DECRYPTED)
		return 0;
2089

J
Johannes Berg 已提交
2090
	if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
2091 2092
		if (unlikely(!ieee80211_has_protected(fc) &&
			     ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
2093
			     rx->key)) {
2094 2095 2096 2097 2098
			if (ieee80211_is_deauth(fc) ||
			    ieee80211_is_disassoc(fc))
				cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
							     rx->skb->data,
							     rx->skb->len);
2099
			return -EACCES;
2100
		}
2101
		/* BIP does not use Protected field, so need to check MMIE */
2102
		if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
2103
			     ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
2104 2105 2106 2107 2108
			if (ieee80211_is_deauth(fc) ||
			    ieee80211_is_disassoc(fc))
				cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
							     rx->skb->data,
							     rx->skb->len);
2109
			return -EACCES;
2110
		}
2111 2112 2113 2114 2115
		/*
		 * When using MFP, Action frames are not allowed prior to
		 * having configured keys.
		 */
		if (unlikely(ieee80211_is_action(fc) && !rx->key &&
2116
			     ieee80211_is_robust_mgmt_frame(rx->skb)))
2117 2118
			return -EACCES;
	}
2119

2120
	return 0;
2121 2122
}

2123
static int
2124
__ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
2125
{
J
Johannes Berg 已提交
2126
	struct ieee80211_sub_if_data *sdata = rx->sdata;
2127
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2128 2129 2130
	bool check_port_control = false;
	struct ethhdr *ehdr;
	int ret;
2131

2132
	*port_control = false;
2133 2134
	if (ieee80211_has_a4(hdr->frame_control) &&
	    sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
2135
		return -1;
2136

2137 2138 2139 2140 2141 2142 2143 2144 2145
	if (sdata->vif.type == NL80211_IFTYPE_STATION &&
	    !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {

		if (!sdata->u.mgd.use_4addr)
			return -1;
		else
			check_port_control = true;
	}

2146
	if (is_multicast_ether_addr(hdr->addr1) &&
2147
	    sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
2148
		return -1;
2149

2150
	ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
2151
	if (ret < 0)
2152 2153 2154
		return ret;

	ehdr = (struct ethhdr *) rx->skb->data;
2155 2156 2157
	if (ehdr->h_proto == rx->sdata->control_port_protocol)
		*port_control = true;
	else if (check_port_control)
2158 2159 2160
		return -1;

	return 0;
2161
}
2162

2163 2164 2165
/*
 * requires that rx->skb is a frame with ethernet header
 */
2166
static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
2167
{
2168
	static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
2169 2170 2171 2172 2173 2174 2175
		= { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
	struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;

	/*
	 * Allow EAPOL frames to us/the PAE group address regardless
	 * of whether the frame was encrypted or not.
	 */
2176
	if (ehdr->h_proto == rx->sdata->control_port_protocol &&
2177 2178
	    (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
	     ether_addr_equal(ehdr->h_dest, pae_group_addr)))
2179 2180 2181
		return true;

	if (ieee80211_802_1x_port_control(rx) ||
2182
	    ieee80211_drop_unencrypted(rx, fc))
2183 2184 2185 2186 2187 2188 2189 2190
		return false;

	return true;
}

/*
 * requires that rx->skb is a frame with ethernet header
 */
2191
static void
2192
ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
2193
{
J
Johannes Berg 已提交
2194 2195
	struct ieee80211_sub_if_data *sdata = rx->sdata;
	struct net_device *dev = sdata->dev;
2196
	struct sk_buff *skb, *xmit_skb;
2197 2198
	struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
	struct sta_info *dsta;
2199

2200 2201
	skb = rx->skb;
	xmit_skb = NULL;
2202

2203 2204
	ieee80211_rx_stats(dev, skb->len);

2205 2206 2207 2208 2209 2210
	if (rx->sta) {
		/* The seqno index has the same property as needed
		 * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
		 * for non-QoS-data frames. Here we know it's a data
		 * frame, so count MSDUs.
		 */
2211
		u64_stats_update_begin(&rx->sta->rx_stats.syncp);
2212
		rx->sta->rx_stats.msdu[rx->seqno_idx]++;
2213
		u64_stats_update_end(&rx->sta->rx_stats.syncp);
2214 2215
	}

2216 2217
	if ((sdata->vif.type == NL80211_IFTYPE_AP ||
	     sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
2218
	    !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
2219
	    (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
2220 2221
		if (is_multicast_ether_addr(ehdr->h_dest) &&
		    ieee80211_vif_get_num_mcast_if(sdata) != 0) {
2222 2223 2224 2225
			/*
			 * send multicast frames both to higher layers in
			 * local net stack and back to the wireless medium
			 */
2226
			xmit_skb = skb_copy(skb, GFP_ATOMIC);
2227
			if (!xmit_skb)
J
Johannes Berg 已提交
2228
				net_info_ratelimited("%s: failed to clone multicast frame\n",
2229
						    dev->name);
2230
		} else if (!is_multicast_ether_addr(ehdr->h_dest)) {
2231 2232
			dsta = sta_info_get(sdata, skb->data);
			if (dsta) {
2233 2234 2235 2236 2237
				/*
				 * The destination station is associated to
				 * this AP (in this VLAN), so send the frame
				 * directly to it and do not pass it to local
				 * net stack.
2238
				 */
2239
				xmit_skb = skb;
2240 2241 2242 2243 2244
				skb = NULL;
			}
		}
	}

2245
#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
2246 2247 2248 2249 2250 2251
	if (skb) {
		/* 'align' will only take the values 0 or 2 here since all
		 * frames are required to be aligned to 2-byte boundaries
		 * when being passed to mac80211; the code here works just
		 * as well if that isn't true, but mac80211 assumes it can
		 * access fields as 2-byte aligned (e.g. for ether_addr_equal)
2252
		 */
2253 2254 2255
		int align;

		align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3;
2256 2257 2258 2259 2260 2261
		if (align) {
			if (WARN_ON(skb_headroom(skb) < 3)) {
				dev_kfree_skb(skb);
				skb = NULL;
			} else {
				u8 *data = skb->data;
2262 2263 2264 2265
				size_t len = skb_headlen(skb);
				skb->data -= align;
				memmove(skb->data, data, len);
				skb_set_tail_pointer(skb, len);
2266 2267
			}
		}
2268
	}
2269 2270
#endif

2271 2272 2273 2274
	if (skb) {
		/* deliver to local stack */
		skb->protocol = eth_type_trans(skb, dev);
		memset(skb->cb, 0, sizeof(skb->cb));
2275 2276
		if (rx->napi)
			napi_gro_receive(rx->napi, skb);
J
Johannes Berg 已提交
2277 2278
		else
			netif_receive_skb(skb);
2279 2280
	}

2281
	if (xmit_skb) {
2282 2283 2284 2285 2286 2287
		/*
		 * Send to wireless media and increase priority by 256 to
		 * keep the received priority instead of reclassifying
		 * the frame (see cfg80211_classify8021d).
		 */
		xmit_skb->priority += 256;
2288
		xmit_skb->protocol = htons(ETH_P_802_3);
2289 2290
		skb_reset_network_header(xmit_skb);
		skb_reset_mac_header(xmit_skb);
2291
		dev_queue_xmit(xmit_skb);
2292
	}
2293 2294
}

2295
static ieee80211_rx_result debug_noinline
2296
ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
2297
{
J
Johannes Berg 已提交
2298
	struct net_device *dev = rx->sdata->dev;
Z
Zhu Yi 已提交
2299
	struct sk_buff *skb = rx->skb;
2300 2301
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
	__le16 fc = hdr->frame_control;
Z
Zhu Yi 已提交
2302
	struct sk_buff_head frame_list;
2303
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2304
	struct ethhdr ethhdr;
2305
	const u8 *check_da = ethhdr.h_dest, *check_sa = ethhdr.h_source;
2306

2307
	if (unlikely(!ieee80211_is_data(fc)))
2308
		return RX_CONTINUE;
2309

2310
	if (unlikely(!ieee80211_is_data_present(fc)))
J
Johannes Berg 已提交
2311
		return RX_DROP_MONITOR;
2312

2313
	if (!(status->rx_flags & IEEE80211_RX_AMSDU))
2314
		return RX_CONTINUE;
2315

2316 2317 2318 2319 2320 2321 2322 2323 2324 2325 2326 2327 2328
	if (unlikely(ieee80211_has_a4(hdr->frame_control))) {
		switch (rx->sdata->vif.type) {
		case NL80211_IFTYPE_AP_VLAN:
			if (!rx->sdata->u.vlan.sta)
				return RX_DROP_UNUSABLE;
			break;
		case NL80211_IFTYPE_STATION:
			if (!rx->sdata->u.mgd.use_4addr)
				return RX_DROP_UNUSABLE;
			break;
		default:
			return RX_DROP_UNUSABLE;
		}
2329 2330 2331 2332 2333 2334 2335 2336 2337 2338 2339 2340 2341 2342 2343 2344 2345
		check_da = NULL;
		check_sa = NULL;
	} else switch (rx->sdata->vif.type) {
		case NL80211_IFTYPE_AP:
		case NL80211_IFTYPE_AP_VLAN:
			check_da = NULL;
			break;
		case NL80211_IFTYPE_STATION:
			if (!rx->sta ||
			    !test_sta_flag(rx->sta, WLAN_STA_TDLS_PEER))
				check_sa = NULL;
			break;
		case NL80211_IFTYPE_MESH_POINT:
			check_sa = NULL;
			break;
		default:
			break;
2346
	}
2347

2348
	if (is_multicast_ether_addr(hdr->addr1))
J
Johannes Berg 已提交
2349
		return RX_DROP_UNUSABLE;
2350

Z
Zhu Yi 已提交
2351 2352
	skb->dev = dev;
	__skb_queue_head_init(&frame_list);
2353

2354 2355 2356 2357 2358
	if (ieee80211_data_to_8023_exthdr(skb, &ethhdr,
					  rx->sdata->vif.addr,
					  rx->sdata->vif.type))
		return RX_DROP_UNUSABLE;

Z
Zhu Yi 已提交
2359 2360
	ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
				 rx->sdata->vif.type,
2361
				 rx->local->hw.extra_tx_headroom,
2362
				 check_da, check_sa);
2363

Z
Zhu Yi 已提交
2364 2365
	while (!skb_queue_empty(&frame_list)) {
		rx->skb = __skb_dequeue(&frame_list);
2366

2367
		if (!ieee80211_frame_allowed(rx, fc)) {
Z
Zhu Yi 已提交
2368
			dev_kfree_skb(rx->skb);
2369 2370
			continue;
		}
2371 2372 2373 2374

		ieee80211_deliver_skb(rx);
	}

2375
	return RX_QUEUED;
2376 2377
}

I
Ingo Molnar 已提交
2378
#ifdef CONFIG_MAC80211_MESH
2379
static ieee80211_rx_result
2380 2381
ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
{
2382 2383
	struct ieee80211_hdr *fwd_hdr, *hdr;
	struct ieee80211_tx_info *info;
2384 2385
	struct ieee80211s_hdr *mesh_hdr;
	struct sk_buff *skb = rx->skb, *fwd_skb;
J
Johannes Berg 已提交
2386
	struct ieee80211_local *local = rx->local;
J
Johannes Berg 已提交
2387
	struct ieee80211_sub_if_data *sdata = rx->sdata;
2388
	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2389
	u16 ac, q, hdrlen;
2390 2391 2392

	hdr = (struct ieee80211_hdr *) skb->data;
	hdrlen = ieee80211_hdrlen(hdr->frame_control);
2393 2394 2395 2396 2397 2398 2399 2400 2401 2402 2403 2404 2405 2406

	/* make sure fixed part of mesh header is there, also checks skb len */
	if (!pskb_may_pull(rx->skb, hdrlen + 6))
		return RX_DROP_MONITOR;

	mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);

	/* make sure full mesh header is there, also checks skb len */
	if (!pskb_may_pull(rx->skb,
			   hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
		return RX_DROP_MONITOR;

	/* reload pointers */
	hdr = (struct ieee80211_hdr *) skb->data;
2407 2408
	mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);

2409 2410 2411
	if (ieee80211_drop_unencrypted(rx, hdr->frame_control))
		return RX_DROP_MONITOR;

2412 2413 2414
	/* frame is in RMC, don't forward */
	if (ieee80211_is_data(hdr->frame_control) &&
	    is_multicast_ether_addr(hdr->addr1) &&
J
Johannes Berg 已提交
2415
	    mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
2416 2417
		return RX_DROP_MONITOR;

2418
	if (!ieee80211_is_data(hdr->frame_control))
2419 2420 2421 2422 2423
		return RX_CONTINUE;

	if (!mesh_hdr->ttl)
		return RX_DROP_MONITOR;

2424
	if (mesh_hdr->flags & MESH_FLAGS_AE) {
2425
		struct mesh_path *mppath;
2426 2427 2428 2429 2430 2431
		char *proxied_addr;
		char *mpp_addr;

		if (is_multicast_ether_addr(hdr->addr1)) {
			mpp_addr = hdr->addr3;
			proxied_addr = mesh_hdr->eaddr1;
2432 2433
		} else if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6) {
			/* has_a4 already checked in ieee80211_rx_mesh_check */
2434 2435
			mpp_addr = hdr->addr4;
			proxied_addr = mesh_hdr->eaddr2;
2436 2437
		} else {
			return RX_DROP_MONITOR;
2438
		}
2439 2440

		rcu_read_lock();
J
Johannes Berg 已提交
2441
		mppath = mpp_path_lookup(sdata, proxied_addr);
2442
		if (!mppath) {
J
Johannes Berg 已提交
2443
			mpp_path_add(sdata, proxied_addr, mpp_addr);
2444 2445
		} else {
			spin_lock_bh(&mppath->state_lock);
2446
			if (!ether_addr_equal(mppath->mpp, mpp_addr))
2447
				memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
2448
			mppath->exp_time = jiffies;
2449 2450 2451 2452 2453
			spin_unlock_bh(&mppath->state_lock);
		}
		rcu_read_unlock();
	}

2454 2455
	/* Frame has reached destination.  Don't forward */
	if (!is_multicast_ether_addr(hdr->addr1) &&
2456
	    ether_addr_equal(sdata->vif.addr, hdr->addr3))
2457 2458
		return RX_CONTINUE;

2459 2460
	ac = ieee80211_select_queue_80211(sdata, skb, hdr);
	q = sdata->vif.hw_queue[ac];
2461
	if (ieee80211_queue_stopped(&local->hw, q)) {
2462
		IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
2463 2464 2465
		return RX_DROP_MONITOR;
	}
	skb_set_queue_mapping(skb, q);
2466

2467 2468
	if (!--mesh_hdr->ttl) {
		IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
2469
		goto out;
2470 2471
	}

2472 2473 2474
	if (!ifmsh->mshcfg.dot11MeshForwarding)
		goto out;

2475 2476
	fwd_skb = skb_copy_expand(skb, local->tx_headroom +
				       sdata->encrypt_headroom, 0, GFP_ATOMIC);
2477
	if (!fwd_skb) {
J
Johannes Berg 已提交
2478
		net_info_ratelimited("%s: failed to clone mesh frame\n",
2479
				    sdata->name);
2480 2481 2482 2483
		goto out;
	}

	fwd_hdr =  (struct ieee80211_hdr *) fwd_skb->data;
2484
	fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
2485 2486 2487 2488 2489 2490 2491 2492
	info = IEEE80211_SKB_CB(fwd_skb);
	memset(info, 0, sizeof(*info));
	info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
	info->control.vif = &rx->sdata->vif;
	info->control.jiffies = jiffies;
	if (is_multicast_ether_addr(fwd_hdr->addr1)) {
		IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
		memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
M
Marco Porsch 已提交
2493 2494
		/* update power mode indication when forwarding */
		ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
J
Johannes Berg 已提交
2495
	} else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
M
Marco Porsch 已提交
2496
		/* mesh power mode flags updated in mesh_nexthop_lookup */
2497 2498 2499
		IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
	} else {
		/* unable to resolve next hop */
J
Johannes Berg 已提交
2500
		mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
2501 2502 2503
				   fwd_hdr->addr3, 0,
				   WLAN_REASON_MESH_PATH_NOFORWARD,
				   fwd_hdr->addr2);
2504
		IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
2505
		kfree_skb(fwd_skb);
2506
		return RX_DROP_MONITOR;
2507 2508
	}

2509 2510
	IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
	ieee80211_add_pending_skb(local, fwd_skb);
J
Johannes Berg 已提交
2511
 out:
2512
	if (is_multicast_ether_addr(hdr->addr1))
2513
		return RX_CONTINUE;
2514
	return RX_DROP_MONITOR;
2515
}
I
Ingo Molnar 已提交
2516
#endif
2517

2518
static ieee80211_rx_result debug_noinline
2519
ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
2520
{
J
Johannes Berg 已提交
2521
	struct ieee80211_sub_if_data *sdata = rx->sdata;
2522
	struct ieee80211_local *local = rx->local;
J
Johannes Berg 已提交
2523
	struct net_device *dev = sdata->dev;
2524 2525
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
	__le16 fc = hdr->frame_control;
2526
	bool port_control;
2527
	int err;
2528

2529
	if (unlikely(!ieee80211_is_data(hdr->frame_control)))
2530
		return RX_CONTINUE;
2531

2532
	if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
J
Johannes Berg 已提交
2533
		return RX_DROP_MONITOR;
2534

2535
	/*
2536 2537
	 * Send unexpected-4addr-frame event to hostapd. For older versions,
	 * also drop the frame to cooked monitor interfaces.
2538 2539
	 */
	if (ieee80211_has_a4(hdr->frame_control) &&
2540 2541 2542 2543 2544
	    sdata->vif.type == NL80211_IFTYPE_AP) {
		if (rx->sta &&
		    !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
			cfg80211_rx_unexpected_4addr_frame(
				rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
2545
		return RX_DROP_MONITOR;
2546
	}
2547

2548
	err = __ieee80211_data_to_8023(rx, &port_control);
2549
	if (unlikely(err))
J
Johannes Berg 已提交
2550
		return RX_DROP_UNUSABLE;
2551

2552
	if (!ieee80211_frame_allowed(rx, fc))
J
Johannes Berg 已提交
2553
		return RX_DROP_MONITOR;
2554

2555 2556 2557 2558 2559 2560 2561 2562 2563 2564 2565
	/* directly handle TDLS channel switch requests/responses */
	if (unlikely(((struct ethhdr *)rx->skb->data)->h_proto ==
						cpu_to_be16(ETH_P_TDLS))) {
		struct ieee80211_tdls_data *tf = (void *)rx->skb->data;

		if (pskb_may_pull(rx->skb,
				  offsetof(struct ieee80211_tdls_data, u)) &&
		    tf->payload_type == WLAN_TDLS_SNAP_RFTYPE &&
		    tf->category == WLAN_CATEGORY_TDLS &&
		    (tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST ||
		     tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_RESPONSE)) {
2566 2567
			skb_queue_tail(&local->skb_queue_tdls_chsw, rx->skb);
			schedule_work(&local->tdls_chsw_work);
2568
			if (rx->sta)
2569
				rx->sta->rx_stats.packets++;
2570 2571 2572 2573 2574

			return RX_QUEUED;
		}
	}

2575 2576 2577 2578 2579 2580 2581 2582
	if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
	    unlikely(port_control) && sdata->bss) {
		sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
				     u.ap);
		dev = sdata->dev;
		rx->sdata = sdata;
	}

2583 2584
	rx->skb->dev = dev;

2585 2586
	if (!ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
	    local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
2587 2588 2589
	    !is_multicast_ether_addr(
		    ((struct ethhdr *)rx->skb->data)->h_dest) &&
	    (!local->scanning &&
2590 2591 2592
	     !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)))
		mod_timer(&local->dynamic_ps_timer, jiffies +
			  msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2593

2594
	ieee80211_deliver_skb(rx);
2595

2596
	return RX_QUEUED;
2597 2598
}

2599
static ieee80211_rx_result debug_noinline
2600
ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
2601 2602
{
	struct sk_buff *skb = rx->skb;
2603
	struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
2604 2605 2606 2607
	struct tid_ampdu_rx *tid_agg_rx;
	u16 start_seq_num;
	u16 tid;

2608
	if (likely(!ieee80211_is_ctl(bar->frame_control)))
2609
		return RX_CONTINUE;
2610

2611
	if (ieee80211_is_back_req(bar->frame_control)) {
2612 2613 2614
		struct {
			__le16 control, start_seq_num;
		} __packed bar_data;
2615 2616 2617
		struct ieee80211_event event = {
			.type = BAR_RX_EVENT,
		};
2618

2619
		if (!rx->sta)
2620
			return RX_DROP_MONITOR;
2621 2622 2623 2624 2625 2626

		if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
				  &bar_data, sizeof(bar_data)))
			return RX_DROP_MONITOR;

		tid = le16_to_cpu(bar_data.control) >> 12;
2627

2628 2629 2630 2631 2632 2633
		if (!test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
		    !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg))
			ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid,
					     WLAN_BACK_RECIPIENT,
					     WLAN_REASON_QSTA_REQUIRE_SETUP);

2634 2635
		tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
		if (!tid_agg_rx)
2636
			return RX_DROP_MONITOR;
2637

2638
		start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
2639 2640 2641
		event.u.ba.tid = tid;
		event.u.ba.ssn = start_seq_num;
		event.u.ba.sta = &rx->sta->sta;
2642 2643

		/* reset session timer */
2644 2645 2646
		if (tid_agg_rx->timeout)
			mod_timer(&tid_agg_rx->session_timer,
				  TU_TO_EXP_TIME(tid_agg_rx->timeout));
2647

2648
		spin_lock(&tid_agg_rx->reorder_lock);
2649
		/* release stored frames up to start of BAR */
2650
		ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
2651
						 start_seq_num, frames);
2652 2653
		spin_unlock(&tid_agg_rx->reorder_lock);

2654 2655
		drv_event_callback(rx->local, rx->sdata, &event);

2656 2657
		kfree_skb(skb);
		return RX_QUEUED;
2658 2659
	}

2660 2661 2662 2663 2664 2665
	/*
	 * After this point, we only want management frames,
	 * so we can drop all remaining control frames to
	 * cooked monitor interfaces.
	 */
	return RX_DROP_MONITOR;
2666 2667
}

2668 2669 2670
static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
					   struct ieee80211_mgmt *mgmt,
					   size_t len)
2671 2672 2673 2674 2675
{
	struct ieee80211_local *local = sdata->local;
	struct sk_buff *skb;
	struct ieee80211_mgmt *resp;

2676
	if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
2677 2678 2679 2680
		/* Not to own unicast address */
		return;
	}

2681 2682
	if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
	    !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
2683
		/* Not from the current AP or not associated yet. */
2684 2685 2686 2687 2688 2689 2690 2691 2692 2693 2694 2695 2696 2697 2698 2699
		return;
	}

	if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
		/* Too short SA Query request frame */
		return;
	}

	skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
	if (skb == NULL)
		return;

	skb_reserve(skb, local->hw.extra_tx_headroom);
	resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
	memset(resp, 0, 24);
	memcpy(resp->da, mgmt->sa, ETH_ALEN);
2700
	memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
2701
	memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
2702 2703 2704 2705 2706 2707 2708 2709 2710
	resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
					  IEEE80211_STYPE_ACTION);
	skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
	resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
	resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
	memcpy(resp->u.action.u.sa_query.trans_id,
	       mgmt->u.action.u.sa_query.trans_id,
	       WLAN_SA_QUERY_TR_ID_LEN);

2711
	ieee80211_tx_skb(sdata, skb);
2712 2713
}

2714 2715 2716 2717
static ieee80211_rx_result debug_noinline
ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
{
	struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2718
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2719 2720 2721 2722 2723 2724 2725 2726 2727 2728 2729 2730

	/*
	 * From here on, look only at management frames.
	 * Data and control frames are already handled,
	 * and unknown (reserved) frames are useless.
	 */
	if (rx->skb->len < 24)
		return RX_DROP_MONITOR;

	if (!ieee80211_is_mgmt(mgmt->frame_control))
		return RX_DROP_MONITOR;

J
Johannes Berg 已提交
2731 2732 2733
	if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
	    ieee80211_is_beacon(mgmt->frame_control) &&
	    !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
2734 2735
		int sig = 0;

2736
		if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM))
2737 2738
			sig = status->signal;

J
Johannes Berg 已提交
2739 2740
		cfg80211_report_obss_beacon(rx->local->hw.wiphy,
					    rx->skb->data, rx->skb->len,
2741
					    status->freq, sig);
J
Johannes Berg 已提交
2742 2743 2744
		rx->flags |= IEEE80211_RX_BEACON_REPORTED;
	}

2745 2746 2747 2748 2749 2750
	if (ieee80211_drop_unencrypted_mgmt(rx))
		return RX_DROP_UNUSABLE;

	return RX_CONTINUE;
}

2751 2752 2753 2754
static ieee80211_rx_result debug_noinline
ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
{
	struct ieee80211_local *local = rx->local;
J
Johannes Berg 已提交
2755
	struct ieee80211_sub_if_data *sdata = rx->sdata;
2756
	struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2757
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2758 2759 2760 2761 2762
	int len = rx->skb->len;

	if (!ieee80211_is_action(mgmt->frame_control))
		return RX_CONTINUE;

2763 2764
	/* drop too small frames */
	if (len < IEEE80211_MIN_ACTION_SIZE)
2765
		return RX_DROP_UNUSABLE;
2766

2767
	if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
2768 2769
	    mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED &&
	    mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
2770
		return RX_DROP_UNUSABLE;
2771 2772

	switch (mgmt->u.action.category) {
2773 2774 2775 2776 2777 2778 2779 2780 2781 2782 2783 2784
	case WLAN_CATEGORY_HT:
		/* reject HT action frames from stations not supporting HT */
		if (!rx->sta->sta.ht_cap.ht_supported)
			goto invalid;

		if (sdata->vif.type != NL80211_IFTYPE_STATION &&
		    sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
		    sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
		    sdata->vif.type != NL80211_IFTYPE_AP &&
		    sdata->vif.type != NL80211_IFTYPE_ADHOC)
			break;

2785
		/* verify action & smps_control/chanwidth are present */
2786 2787 2788 2789 2790 2791
		if (len < IEEE80211_MIN_ACTION_SIZE + 2)
			goto invalid;

		switch (mgmt->u.action.u.ht_smps.action) {
		case WLAN_HT_ACTION_SMPS: {
			struct ieee80211_supported_band *sband;
2792
			enum ieee80211_smps_mode smps_mode;
2793 2794 2795 2796

			/* convert to HT capability */
			switch (mgmt->u.action.u.ht_smps.smps_control) {
			case WLAN_HT_SMPS_CONTROL_DISABLED:
2797
				smps_mode = IEEE80211_SMPS_OFF;
2798 2799
				break;
			case WLAN_HT_SMPS_CONTROL_STATIC:
2800
				smps_mode = IEEE80211_SMPS_STATIC;
2801 2802
				break;
			case WLAN_HT_SMPS_CONTROL_DYNAMIC:
2803
				smps_mode = IEEE80211_SMPS_DYNAMIC;
2804 2805 2806 2807 2808 2809
				break;
			default:
				goto invalid;
			}

			/* if no change do nothing */
2810
			if (rx->sta->sta.smps_mode == smps_mode)
2811
				goto handled;
2812
			rx->sta->sta.smps_mode = smps_mode;
2813 2814 2815

			sband = rx->local->hw.wiphy->bands[status->band];

2816 2817
			rate_control_rate_update(local, sband, rx->sta,
						 IEEE80211_RC_SMPS_CHANGED);
2818 2819
			goto handled;
		}
2820 2821 2822
		case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
			struct ieee80211_supported_band *sband;
			u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
2823
			enum ieee80211_sta_rx_bandwidth max_bw, new_bw;
2824 2825

			/* If it doesn't support 40 MHz it can't change ... */
2826 2827
			if (!(rx->sta->sta.ht_cap.cap &
					IEEE80211_HT_CAP_SUP_WIDTH_20_40))
2828 2829
				goto handled;

2830
			if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
2831
				max_bw = IEEE80211_STA_RX_BW_20;
2832
			else
2833 2834 2835 2836 2837
				max_bw = ieee80211_sta_cap_rx_bw(rx->sta);

			/* set cur_max_bandwidth and recalc sta bw */
			rx->sta->cur_max_bandwidth = max_bw;
			new_bw = ieee80211_sta_cur_vht_bw(rx->sta);
2838

2839
			if (rx->sta->sta.bandwidth == new_bw)
2840 2841
				goto handled;

2842
			rx->sta->sta.bandwidth = new_bw;
2843 2844 2845 2846 2847 2848
			sband = rx->local->hw.wiphy->bands[status->band];

			rate_control_rate_update(local, sband, rx->sta,
						 IEEE80211_RC_BW_CHANGED);
			goto handled;
		}
2849 2850 2851 2852
		default:
			goto invalid;
		}

2853
		break;
2854 2855 2856 2857 2858 2859 2860 2861 2862 2863 2864 2865 2866 2867 2868 2869
	case WLAN_CATEGORY_PUBLIC:
		if (len < IEEE80211_MIN_ACTION_SIZE + 1)
			goto invalid;
		if (sdata->vif.type != NL80211_IFTYPE_STATION)
			break;
		if (!rx->sta)
			break;
		if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
			break;
		if (mgmt->u.action.u.ext_chan_switch.action_code !=
				WLAN_PUB_ACTION_EXT_CHANSW_ANN)
			break;
		if (len < offsetof(struct ieee80211_mgmt,
				   u.action.u.ext_chan_switch.variable))
			goto invalid;
		goto queue;
2870 2871 2872 2873 2874 2875 2876 2877 2878 2879 2880 2881 2882 2883 2884 2885 2886 2887 2888 2889 2890 2891 2892
	case WLAN_CATEGORY_VHT:
		if (sdata->vif.type != NL80211_IFTYPE_STATION &&
		    sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
		    sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
		    sdata->vif.type != NL80211_IFTYPE_AP &&
		    sdata->vif.type != NL80211_IFTYPE_ADHOC)
			break;

		/* verify action code is present */
		if (len < IEEE80211_MIN_ACTION_SIZE + 1)
			goto invalid;

		switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
		case WLAN_VHT_ACTION_OPMODE_NOTIF: {
			u8 opmode;

			/* verify opmode is present */
			if (len < IEEE80211_MIN_ACTION_SIZE + 2)
				goto invalid;

			opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;

			ieee80211_vht_handle_opmode(rx->sdata, rx->sta,
2893
						    opmode, status->band);
2894 2895
			goto handled;
		}
2896 2897 2898 2899 2900
		case WLAN_VHT_ACTION_GROUPID_MGMT: {
			if (len < IEEE80211_MIN_ACTION_SIZE + 25)
				goto invalid;
			goto queue;
		}
2901 2902 2903
		default:
			break;
		}
2904
		break;
2905
	case WLAN_CATEGORY_BACK:
2906
		if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2907
		    sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2908
		    sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2909 2910
		    sdata->vif.type != NL80211_IFTYPE_AP &&
		    sdata->vif.type != NL80211_IFTYPE_ADHOC)
2911
			break;
2912

2913 2914 2915 2916
		/* verify action_code is present */
		if (len < IEEE80211_MIN_ACTION_SIZE + 1)
			break;

2917 2918 2919 2920
		switch (mgmt->u.action.u.addba_req.action_code) {
		case WLAN_ACTION_ADDBA_REQ:
			if (len < (IEEE80211_MIN_ACTION_SIZE +
				   sizeof(mgmt->u.action.u.addba_req)))
2921 2922
				goto invalid;
			break;
2923 2924 2925
		case WLAN_ACTION_ADDBA_RESP:
			if (len < (IEEE80211_MIN_ACTION_SIZE +
				   sizeof(mgmt->u.action.u.addba_resp)))
2926 2927
				goto invalid;
			break;
2928 2929 2930
		case WLAN_ACTION_DELBA:
			if (len < (IEEE80211_MIN_ACTION_SIZE +
				   sizeof(mgmt->u.action.u.delba)))
2931 2932 2933 2934
				goto invalid;
			break;
		default:
			goto invalid;
2935
		}
2936

2937
		goto queue;
2938
	case WLAN_CATEGORY_SPECTRUM_MGMT:
2939 2940 2941 2942
		/* verify action_code is present */
		if (len < IEEE80211_MIN_ACTION_SIZE + 1)
			break;

2943 2944
		switch (mgmt->u.action.u.measurement.action_code) {
		case WLAN_ACTION_SPCT_MSR_REQ:
2945
			if (status->band != NL80211_BAND_5GHZ)
2946 2947
				break;

2948 2949
			if (len < (IEEE80211_MIN_ACTION_SIZE +
				   sizeof(mgmt->u.action.u.measurement)))
2950
				break;
2951 2952 2953 2954

			if (sdata->vif.type != NL80211_IFTYPE_STATION)
				break;

2955
			ieee80211_process_measurement_req(sdata, mgmt, len);
2956
			goto handled;
2957 2958 2959 2960
		case WLAN_ACTION_SPCT_CHL_SWITCH: {
			u8 *bssid;
			if (len < (IEEE80211_MIN_ACTION_SIZE +
				   sizeof(mgmt->u.action.u.chan_switch)))
2961
				break;
2962

2963
			if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2964 2965
			    sdata->vif.type != NL80211_IFTYPE_ADHOC &&
			    sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
2966 2967 2968 2969 2970 2971
				break;

			if (sdata->vif.type == NL80211_IFTYPE_STATION)
				bssid = sdata->u.mgd.bssid;
			else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
				bssid = sdata->u.ibss.bssid;
2972 2973
			else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
				bssid = mgmt->sa;
2974 2975 2976 2977
			else
				break;

			if (!ether_addr_equal(mgmt->bssid, bssid))
2978
				break;
S
Sujith 已提交
2979

2980
			goto queue;
2981
			}
2982 2983
		}
		break;
2984 2985 2986
	case WLAN_CATEGORY_SA_QUERY:
		if (len < (IEEE80211_MIN_ACTION_SIZE +
			   sizeof(mgmt->u.action.u.sa_query)))
2987 2988
			break;

2989 2990 2991
		switch (mgmt->u.action.u.sa_query.action) {
		case WLAN_ACTION_SA_QUERY_REQUEST:
			if (sdata->vif.type != NL80211_IFTYPE_STATION)
2992
				break;
2993
			ieee80211_process_sa_query_req(sdata, mgmt, len);
2994
			goto handled;
2995 2996
		}
		break;
2997
	case WLAN_CATEGORY_SELF_PROTECTED:
2998 2999 3000 3001
		if (len < (IEEE80211_MIN_ACTION_SIZE +
			   sizeof(mgmt->u.action.u.self_prot.action_code)))
			break;

3002 3003 3004 3005 3006 3007
		switch (mgmt->u.action.u.self_prot.action_code) {
		case WLAN_SP_MESH_PEERING_OPEN:
		case WLAN_SP_MESH_PEERING_CLOSE:
		case WLAN_SP_MESH_PEERING_CONFIRM:
			if (!ieee80211_vif_is_mesh(&sdata->vif))
				goto invalid;
3008
			if (sdata->u.mesh.user_mpm)
3009 3010 3011 3012 3013 3014 3015 3016 3017 3018
				/* userspace handles this frame */
				break;
			goto queue;
		case WLAN_SP_MGK_INFORM:
		case WLAN_SP_MGK_ACK:
			if (!ieee80211_vif_is_mesh(&sdata->vif))
				goto invalid;
			break;
		}
		break;
3019
	case WLAN_CATEGORY_MESH_ACTION:
3020 3021 3022 3023
		if (len < (IEEE80211_MIN_ACTION_SIZE +
			   sizeof(mgmt->u.action.u.mesh_action.action_code)))
			break;

3024 3025
		if (!ieee80211_vif_is_mesh(&sdata->vif))
			break;
3026
		if (mesh_action_is_path_sel(mgmt) &&
J
Johannes Berg 已提交
3027
		    !mesh_path_sel_is_hwmp(sdata))
3028 3029
			break;
		goto queue;
3030
	}
3031

3032 3033
	return RX_CONTINUE;

3034
 invalid:
3035
	status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
3036 3037 3038 3039 3040
	/* will return in the next handlers */
	return RX_CONTINUE;

 handled:
	if (rx->sta)
3041
		rx->sta->rx_stats.packets++;
3042 3043 3044 3045 3046 3047 3048 3049
	dev_kfree_skb(rx->skb);
	return RX_QUEUED;

 queue:
	rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
	skb_queue_tail(&sdata->skb_queue, rx->skb);
	ieee80211_queue_work(&local->hw, &sdata->work);
	if (rx->sta)
3050
		rx->sta->rx_stats.packets++;
3051 3052 3053 3054 3055 3056
	return RX_QUEUED;
}

static ieee80211_rx_result debug_noinline
ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
{
3057
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3058
	int sig = 0;
3059 3060

	/* skip known-bad action frames and return them in the next handler */
3061
	if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
3062
		return RX_CONTINUE;
3063

3064 3065 3066 3067 3068 3069 3070
	/*
	 * Getting here means the kernel doesn't know how to handle
	 * it, but maybe userspace does ... include returned frames
	 * so userspace can register for those to know whether ones
	 * it transmitted were processed or returned.
	 */

3071
	if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM))
3072 3073
		sig = status->signal;

3074
	if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
3075
			     rx->skb->data, rx->skb->len, 0)) {
3076
		if (rx->sta)
3077
			rx->sta->rx_stats.packets++;
3078 3079 3080 3081 3082 3083 3084 3085 3086 3087 3088 3089 3090 3091
		dev_kfree_skb(rx->skb);
		return RX_QUEUED;
	}

	return RX_CONTINUE;
}

static ieee80211_rx_result debug_noinline
ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
{
	struct ieee80211_local *local = rx->local;
	struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
	struct sk_buff *nskb;
	struct ieee80211_sub_if_data *sdata = rx->sdata;
3092
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3093 3094 3095 3096 3097 3098 3099 3100 3101

	if (!ieee80211_is_action(mgmt->frame_control))
		return RX_CONTINUE;

	/*
	 * For AP mode, hostapd is responsible for handling any action
	 * frames that we didn't handle, including returning unknown
	 * ones. For all other modes we will return them to the sender,
	 * setting the 0x80 bit in the action category, as required by
3102
	 * 802.11-2012 9.24.4.
3103 3104 3105 3106
	 * Newer versions of hostapd shall also use the management frame
	 * registration mechanisms, but older ones still use cooked
	 * monitor interfaces so push all frames there.
	 */
3107
	if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
3108 3109 3110
	    (sdata->vif.type == NL80211_IFTYPE_AP ||
	     sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
		return RX_DROP_MONITOR;
3111

3112 3113 3114
	if (is_multicast_ether_addr(mgmt->da))
		return RX_DROP_MONITOR;

3115 3116 3117 3118 3119 3120 3121
	/* do not return rejected action frames */
	if (mgmt->u.action.category & 0x80)
		return RX_DROP_UNUSABLE;

	nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
			       GFP_ATOMIC);
	if (nskb) {
3122
		struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
3123

3124 3125 3126
		nmgmt->u.action.category |= 0x80;
		memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
		memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
3127 3128 3129

		memset(nskb->cb, 0, sizeof(nskb->cb));

3130 3131 3132 3133 3134 3135
		if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
			struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);

			info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
				      IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
				      IEEE80211_TX_CTL_NO_CCK_RATE;
3136
			if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
3137 3138 3139 3140 3141 3142
				info->hw_queue =
					local->hw.offchannel_tx_hw_queue;
		}

		__ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7,
					    status->band);
3143
	}
3144 3145
	dev_kfree_skb(rx->skb);
	return RX_QUEUED;
3146 3147
}

3148
static ieee80211_rx_result debug_noinline
3149
ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
3150
{
J
Johannes Berg 已提交
3151
	struct ieee80211_sub_if_data *sdata = rx->sdata;
3152 3153
	struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
	__le16 stype;
3154

3155
	stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
3156

3157 3158
	if (!ieee80211_vif_is_mesh(&sdata->vif) &&
	    sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3159
	    sdata->vif.type != NL80211_IFTYPE_OCB &&
3160 3161
	    sdata->vif.type != NL80211_IFTYPE_STATION)
		return RX_DROP_MONITOR;
3162

3163
	switch (stype) {
J
Johannes Berg 已提交
3164
	case cpu_to_le16(IEEE80211_STYPE_AUTH):
3165 3166 3167 3168
	case cpu_to_le16(IEEE80211_STYPE_BEACON):
	case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
		/* process for all: mesh, mlme, ibss */
		break;
J
Johannes Berg 已提交
3169 3170
	case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
	case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
3171 3172
	case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
	case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
3173 3174 3175 3176
		if (is_multicast_ether_addr(mgmt->da) &&
		    !is_broadcast_ether_addr(mgmt->da))
			return RX_DROP_MONITOR;

3177 3178 3179 3180 3181
		/* process only for station */
		if (sdata->vif.type != NL80211_IFTYPE_STATION)
			return RX_DROP_MONITOR;
		break;
	case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
3182 3183 3184
		/* process only for ibss and mesh */
		if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
		    sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
3185 3186 3187 3188 3189
			return RX_DROP_MONITOR;
		break;
	default:
		return RX_DROP_MONITOR;
	}
3190

3191
	/* queue up frame and kick off work to process it */
3192
	rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
3193 3194
	skb_queue_tail(&sdata->skb_queue, rx->skb);
	ieee80211_queue_work(&rx->local->hw, &sdata->work);
3195
	if (rx->sta)
3196
		rx->sta->rx_stats.packets++;
3197

3198
	return RX_QUEUED;
3199 3200
}

J
Johannes Berg 已提交
3201 3202
static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
					struct ieee80211_rate *rate)
3203 3204 3205 3206 3207
{
	struct ieee80211_sub_if_data *sdata;
	struct ieee80211_local *local = rx->local;
	struct sk_buff *skb = rx->skb, *skb2;
	struct net_device *prev_dev = NULL;
J
Johannes Berg 已提交
3208
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3209
	int needed_headroom;
3210

3211 3212 3213 3214 3215
	/*
	 * If cooked monitor has been processed already, then
	 * don't do it again. If not, set the flag.
	 */
	if (rx->flags & IEEE80211_RX_CMNTR)
3216
		goto out_free_skb;
3217
	rx->flags |= IEEE80211_RX_CMNTR;
3218

3219 3220 3221 3222
	/* If there are no cooked monitor interfaces, just free the SKB */
	if (!local->cooked_mntrs)
		goto out_free_skb;

3223 3224
	/* vendor data is long removed here */
	status->flag &= ~RX_FLAG_RADIOTAP_VENDOR_DATA;
3225
	/* room for the radiotap header based on driver features */
3226
	needed_headroom = ieee80211_rx_radiotap_hdrlen(local, status, skb);
3227

3228 3229 3230
	if (skb_headroom(skb) < needed_headroom &&
	    pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
		goto out_free_skb;
3231

3232
	/* prepend radiotap information */
3233 3234
	ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
					 false);
3235

3236
	skb_reset_mac_header(skb);
3237 3238 3239 3240 3241
	skb->ip_summed = CHECKSUM_UNNECESSARY;
	skb->pkt_type = PACKET_OTHERHOST;
	skb->protocol = htons(ETH_P_802_2);

	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3242
		if (!ieee80211_sdata_running(sdata))
3243 3244
			continue;

3245
		if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3246
		    !(sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES))
3247 3248 3249 3250 3251 3252
			continue;

		if (prev_dev) {
			skb2 = skb_clone(skb, GFP_ATOMIC);
			if (skb2) {
				skb2->dev = prev_dev;
3253
				netif_receive_skb(skb2);
3254 3255 3256 3257
			}
		}

		prev_dev = sdata->dev;
3258
		ieee80211_rx_stats(sdata->dev, skb->len);
3259 3260 3261 3262
	}

	if (prev_dev) {
		skb->dev = prev_dev;
3263
		netif_receive_skb(skb);
3264 3265
		return;
	}
3266 3267 3268 3269 3270

 out_free_skb:
	dev_kfree_skb(skb);
}

3271 3272 3273 3274 3275 3276 3277
static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
					 ieee80211_rx_result res)
{
	switch (res) {
	case RX_DROP_MONITOR:
		I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
		if (rx->sta)
3278
			rx->sta->rx_stats.dropped++;
3279 3280 3281 3282 3283 3284 3285 3286 3287
		/* fall through */
	case RX_CONTINUE: {
		struct ieee80211_rate *rate = NULL;
		struct ieee80211_supported_band *sband;
		struct ieee80211_rx_status *status;

		status = IEEE80211_SKB_RXCB((rx->skb));

		sband = rx->local->hw.wiphy->bands[status->band];
3288 3289
		if (!(status->flag & RX_FLAG_HT) &&
		    !(status->flag & RX_FLAG_VHT))
3290 3291 3292 3293 3294 3295 3296 3297
			rate = &sband->bitrates[status->rate_idx];

		ieee80211_rx_cooked_monitor(rx, rate);
		break;
		}
	case RX_DROP_UNUSABLE:
		I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
		if (rx->sta)
3298
			rx->sta->rx_stats.dropped++;
3299 3300 3301 3302 3303 3304 3305
		dev_kfree_skb(rx->skb);
		break;
	case RX_QUEUED:
		I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
		break;
	}
}
3306

3307 3308
static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
				  struct sk_buff_head *frames)
3309 3310
{
	ieee80211_rx_result res = RX_DROP_MONITOR;
3311
	struct sk_buff *skb;
3312

3313 3314 3315 3316
#define CALL_RXH(rxh)			\
	do {				\
		res = rxh(rx);		\
		if (res != RX_CONTINUE)	\
3317
			goto rxh_next;  \
3318
	} while (0)
3319

3320 3321 3322 3323 3324 3325
	/* Lock here to avoid hitting all of the data used in the RX
	 * path (e.g. key data, station data, ...) concurrently when
	 * a frame is released from the reorder buffer due to timeout
	 * from the timer, potentially concurrently with RX from the
	 * driver.
	 */
3326
	spin_lock_bh(&rx->local->rx_path_lock);
3327

3328
	while ((skb = __skb_dequeue(frames))) {
3329 3330 3331 3332 3333 3334 3335
		/*
		 * all the other fields are valid across frames
		 * that belong to an aMPDU since they are on the
		 * same TID from the same station
		 */
		rx->skb = skb;

3336 3337 3338 3339 3340 3341
		CALL_RXH(ieee80211_rx_h_check_more_data);
		CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll);
		CALL_RXH(ieee80211_rx_h_sta_process);
		CALL_RXH(ieee80211_rx_h_decrypt);
		CALL_RXH(ieee80211_rx_h_defragment);
		CALL_RXH(ieee80211_rx_h_michael_mic_verify);
3342
		/* must be after MMIC verify so header is counted in MPDU mic */
I
Ingo Molnar 已提交
3343
#ifdef CONFIG_MAC80211_MESH
3344
		if (ieee80211_vif_is_mesh(&rx->sdata->vif))
3345
			CALL_RXH(ieee80211_rx_h_mesh_fwding);
I
Ingo Molnar 已提交
3346
#endif
3347 3348
		CALL_RXH(ieee80211_rx_h_amsdu);
		CALL_RXH(ieee80211_rx_h_data);
3349 3350 3351 3352 3353 3354

		/* special treatment -- needs the queue */
		res = ieee80211_rx_h_ctrl(rx, frames);
		if (res != RX_CONTINUE)
			goto rxh_next;

3355 3356 3357 3358 3359
		CALL_RXH(ieee80211_rx_h_mgmt_check);
		CALL_RXH(ieee80211_rx_h_action);
		CALL_RXH(ieee80211_rx_h_userspace_mgmt);
		CALL_RXH(ieee80211_rx_h_action_return);
		CALL_RXH(ieee80211_rx_h_mgmt);
3360

3361 3362
 rxh_next:
		ieee80211_rx_handlers_result(rx, res);
3363

3364
#undef CALL_RXH
3365
	}
3366

3367
	spin_unlock_bh(&rx->local->rx_path_lock);
3368 3369
}

3370
static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
3371
{
3372
	struct sk_buff_head reorder_release;
3373 3374
	ieee80211_rx_result res = RX_DROP_MONITOR;

3375 3376
	__skb_queue_head_init(&reorder_release);

3377 3378 3379 3380 3381
#define CALL_RXH(rxh)			\
	do {				\
		res = rxh(rx);		\
		if (res != RX_CONTINUE)	\
			goto rxh_next;  \
3382
	} while (0)
3383

3384 3385
	CALL_RXH(ieee80211_rx_h_check_dup);
	CALL_RXH(ieee80211_rx_h_check);
3386

3387
	ieee80211_rx_reorder_ampdu(rx, &reorder_release);
3388

3389
	ieee80211_rx_handlers(rx, &reorder_release);
3390
	return;
3391

3392
 rxh_next:
3393 3394 3395
	ieee80211_rx_handlers_result(rx, res);

#undef CALL_RXH
3396 3397
}

3398
/*
3399 3400
 * This function makes calls into the RX path, therefore
 * it has to be invoked under RCU read lock.
3401 3402 3403
 */
void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
{
3404
	struct sk_buff_head frames;
3405 3406 3407 3408
	struct ieee80211_rx_data rx = {
		.sta = sta,
		.sdata = sta->sdata,
		.local = sta->local,
3409 3410 3411
		/* This is OK -- must be QoS data frame */
		.security_idx = tid,
		.seqno_idx = tid,
3412
		.napi = NULL, /* must be NULL to not have races */
3413
	};
3414 3415 3416 3417 3418
	struct tid_ampdu_rx *tid_agg_rx;

	tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
	if (!tid_agg_rx)
		return;
3419

3420 3421
	__skb_queue_head_init(&frames);

3422
	spin_lock(&tid_agg_rx->reorder_lock);
3423
	ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3424
	spin_unlock(&tid_agg_rx->reorder_lock);
3425

3426 3427 3428 3429 3430 3431 3432 3433 3434
	if (!skb_queue_empty(&frames)) {
		struct ieee80211_event event = {
			.type = BA_FRAME_TIMEOUT,
			.u.ba.tid = tid,
			.u.ba.sta = &sta->sta,
		};
		drv_event_callback(rx.local, rx.sdata, &event);
	}

3435
	ieee80211_rx_handlers(&rx, &frames);
3436 3437
}

3438 3439 3440 3441 3442 3443 3444 3445 3446 3447 3448 3449 3450 3451 3452 3453 3454 3455 3456 3457 3458 3459 3460 3461 3462 3463 3464 3465 3466 3467 3468 3469 3470 3471 3472 3473 3474 3475 3476 3477 3478 3479 3480 3481 3482 3483 3484 3485 3486 3487 3488 3489 3490 3491 3492 3493 3494 3495 3496 3497 3498 3499 3500 3501 3502 3503 3504 3505 3506 3507 3508 3509 3510 3511 3512 3513 3514 3515 3516
void ieee80211_mark_rx_ba_filtered_frames(struct ieee80211_sta *pubsta, u8 tid,
					  u16 ssn, u64 filtered,
					  u16 received_mpdus)
{
	struct sta_info *sta;
	struct tid_ampdu_rx *tid_agg_rx;
	struct sk_buff_head frames;
	struct ieee80211_rx_data rx = {
		/* This is OK -- must be QoS data frame */
		.security_idx = tid,
		.seqno_idx = tid,
	};
	int i, diff;

	if (WARN_ON(!pubsta || tid >= IEEE80211_NUM_TIDS))
		return;

	__skb_queue_head_init(&frames);

	sta = container_of(pubsta, struct sta_info, sta);

	rx.sta = sta;
	rx.sdata = sta->sdata;
	rx.local = sta->local;

	rcu_read_lock();
	tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
	if (!tid_agg_rx)
		goto out;

	spin_lock_bh(&tid_agg_rx->reorder_lock);

	if (received_mpdus >= IEEE80211_SN_MODULO >> 1) {
		int release;

		/* release all frames in the reorder buffer */
		release = (tid_agg_rx->head_seq_num + tid_agg_rx->buf_size) %
			   IEEE80211_SN_MODULO;
		ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx,
						 release, &frames);
		/* update ssn to match received ssn */
		tid_agg_rx->head_seq_num = ssn;
	} else {
		ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx, ssn,
						 &frames);
	}

	/* handle the case that received ssn is behind the mac ssn.
	 * it can be tid_agg_rx->buf_size behind and still be valid */
	diff = (tid_agg_rx->head_seq_num - ssn) & IEEE80211_SN_MASK;
	if (diff >= tid_agg_rx->buf_size) {
		tid_agg_rx->reorder_buf_filtered = 0;
		goto release;
	}
	filtered = filtered >> diff;
	ssn += diff;

	/* update bitmap */
	for (i = 0; i < tid_agg_rx->buf_size; i++) {
		int index = (ssn + i) % tid_agg_rx->buf_size;

		tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
		if (filtered & BIT_ULL(i))
			tid_agg_rx->reorder_buf_filtered |= BIT_ULL(index);
	}

	/* now process also frames that the filter marking released */
	ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);

release:
	spin_unlock_bh(&tid_agg_rx->reorder_lock);

	ieee80211_rx_handlers(&rx, &frames);

 out:
	rcu_read_unlock();
}
EXPORT_SYMBOL(ieee80211_mark_rx_ba_filtered_frames);

3517 3518
/* main receive path */

3519
static bool ieee80211_accept_frame(struct ieee80211_rx_data *rx)
3520
{
3521
	struct ieee80211_sub_if_data *sdata = rx->sdata;
J
Johannes Berg 已提交
3522
	struct sk_buff *skb = rx->skb;
3523
	struct ieee80211_hdr *hdr = (void *)skb->data;
J
Johannes Berg 已提交
3524 3525
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
	u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
3526 3527
	int multicast = is_multicast_ether_addr(hdr->addr1);

3528
	switch (sdata->vif.type) {
3529
	case NL80211_IFTYPE_STATION:
3530
		if (!bssid && !sdata->u.mgd.use_4addr)
3531
			return false;
3532 3533 3534
		if (multicast)
			return true;
		return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3535
	case NL80211_IFTYPE_ADHOC:
3536
		if (!bssid)
3537
			return false;
3538 3539
		if (ether_addr_equal(sdata->vif.addr, hdr->addr2) ||
		    ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2))
3540
			return false;
3541
		if (ieee80211_is_beacon(hdr->frame_control))
3542
			return true;
3543
		if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid))
3544
			return false;
3545 3546
		if (!multicast &&
		    !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3547
			return false;
3548
		if (!rx->sta) {
3549
			int rate_idx;
3550 3551
			if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
				rate_idx = 0; /* TODO: HT/VHT rates */
3552
			else
J
Johannes Berg 已提交
3553
				rate_idx = status->rate_idx;
3554 3555
			ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
						 BIT(rate_idx));
3556
		}
3557
		return true;
3558 3559 3560
	case NL80211_IFTYPE_OCB:
		if (!bssid)
			return false;
3561
		if (!ieee80211_is_data_present(hdr->frame_control))
3562
			return false;
3563
		if (!is_broadcast_ether_addr(bssid))
3564
			return false;
3565 3566
		if (!multicast &&
		    !ether_addr_equal(sdata->dev->dev_addr, hdr->addr1))
3567
			return false;
3568
		if (!rx->sta) {
3569 3570 3571 3572 3573 3574 3575 3576
			int rate_idx;
			if (status->flag & RX_FLAG_HT)
				rate_idx = 0; /* TODO: HT rates */
			else
				rate_idx = status->rate_idx;
			ieee80211_ocb_rx_no_sta(sdata, bssid, hdr->addr2,
						BIT(rate_idx));
		}
3577
		return true;
3578
	case NL80211_IFTYPE_MESH_POINT:
3579 3580 3581
		if (multicast)
			return true;
		return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3582 3583
	case NL80211_IFTYPE_AP_VLAN:
	case NL80211_IFTYPE_AP:
3584 3585 3586 3587
		if (!bssid)
			return ether_addr_equal(sdata->vif.addr, hdr->addr1);

		if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
3588 3589 3590 3591 3592 3593
			/*
			 * Accept public action frames even when the
			 * BSSID doesn't match, this is used for P2P
			 * and location updates. Note that mac80211
			 * itself never looks at these frames.
			 */
3594 3595
			if (!multicast &&
			    !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3596
				return false;
J
Johannes Berg 已提交
3597
			if (ieee80211_is_public_action(hdr, skb->len))
3598
				return true;
3599
			return ieee80211_is_beacon(hdr->frame_control);
3600 3601 3602
		}

		if (!ieee80211_has_tods(hdr->frame_control)) {
3603 3604 3605 3606 3607
			/* ignore data frames to TDLS-peers */
			if (ieee80211_is_data(hdr->frame_control))
				return false;
			/* ignore action frames to TDLS-peers */
			if (ieee80211_is_action(hdr->frame_control) &&
3608
			    !is_broadcast_ether_addr(bssid) &&
3609 3610
			    !ether_addr_equal(bssid, hdr->addr1))
				return false;
3611
		}
3612
		return true;
3613
	case NL80211_IFTYPE_WDS:
3614
		if (bssid || !ieee80211_is_data(hdr->frame_control))
3615
			return false;
3616
		return ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2);
3617
	case NL80211_IFTYPE_P2P_DEVICE:
3618 3619 3620 3621
		return ieee80211_is_public_action(hdr, skb->len) ||
		       ieee80211_is_probe_req(hdr->frame_control) ||
		       ieee80211_is_probe_resp(hdr->frame_control) ||
		       ieee80211_is_beacon(hdr->frame_control);
3622 3623 3624
	case NL80211_IFTYPE_NAN:
		/* Currently no frames on NAN interface are allowed */
		return false;
3625
	default:
J
Johannes Berg 已提交
3626
		break;
3627 3628
	}

3629 3630
	WARN_ON_ONCE(1);
	return false;
3631 3632
}

J
Johannes Berg 已提交
3633 3634 3635 3636 3637 3638 3639 3640 3641 3642 3643 3644 3645 3646 3647 3648 3649 3650 3651 3652
void ieee80211_check_fast_rx(struct sta_info *sta)
{
	struct ieee80211_sub_if_data *sdata = sta->sdata;
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_key *key;
	struct ieee80211_fast_rx fastrx = {
		.dev = sdata->dev,
		.vif_type = sdata->vif.type,
		.control_port_protocol = sdata->control_port_protocol,
	}, *old, *new = NULL;
	bool assign = false;

	/* use sparse to check that we don't return without updating */
	__acquire(check_fast_rx);

	BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != sizeof(rfc1042_header));
	BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != ETH_ALEN);
	ether_addr_copy(fastrx.rfc1042_hdr, rfc1042_header);
	ether_addr_copy(fastrx.vif_addr, sdata->vif.addr);

3653 3654
	fastrx.uses_rss = ieee80211_hw_check(&local->hw, USES_RSS);

J
Johannes Berg 已提交
3655 3656 3657 3658 3659 3660 3661 3662 3663 3664 3665 3666 3667 3668 3669 3670 3671 3672 3673 3674 3675 3676 3677 3678 3679 3680 3681 3682 3683 3684 3685 3686 3687 3688 3689 3690 3691 3692 3693 3694 3695 3696 3697 3698 3699 3700 3701 3702 3703 3704 3705 3706 3707 3708 3709 3710 3711 3712 3713 3714 3715 3716 3717 3718 3719 3720 3721 3722 3723 3724 3725 3726 3727 3728 3729 3730 3731 3732 3733 3734 3735 3736 3737 3738 3739 3740 3741 3742 3743 3744 3745 3746 3747 3748 3749 3750 3751 3752 3753 3754 3755 3756 3757 3758 3759 3760 3761 3762 3763 3764 3765 3766 3767 3768 3769 3770 3771 3772 3773 3774 3775 3776 3777 3778 3779 3780 3781 3782 3783 3784 3785 3786 3787 3788 3789 3790 3791 3792 3793 3794 3795 3796 3797 3798 3799 3800 3801 3802 3803 3804
	/* fast-rx doesn't do reordering */
	if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
	    !ieee80211_hw_check(&local->hw, SUPPORTS_REORDERING_BUFFER))
		goto clear;

	switch (sdata->vif.type) {
	case NL80211_IFTYPE_STATION:
		/* 4-addr is harder to deal with, later maybe */
		if (sdata->u.mgd.use_4addr)
			goto clear;
		/* software powersave is a huge mess, avoid all of it */
		if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK))
			goto clear;
		if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
		    !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS))
			goto clear;
		if (sta->sta.tdls) {
			fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
			fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
			fastrx.expected_ds_bits = 0;
		} else {
			fastrx.sta_notify = sdata->u.mgd.probe_send_count > 0;
			fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
			fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr3);
			fastrx.expected_ds_bits =
				cpu_to_le16(IEEE80211_FCTL_FROMDS);
		}
		break;
	case NL80211_IFTYPE_AP_VLAN:
	case NL80211_IFTYPE_AP:
		/* parallel-rx requires this, at least with calls to
		 * ieee80211_sta_ps_transition()
		 */
		if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
			goto clear;
		fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
		fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
		fastrx.expected_ds_bits = cpu_to_le16(IEEE80211_FCTL_TODS);

		fastrx.internal_forward =
			!(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
			(sdata->vif.type != NL80211_IFTYPE_AP_VLAN ||
			 !sdata->u.vlan.sta);
		break;
	default:
		goto clear;
	}

	if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED))
		goto clear;

	rcu_read_lock();
	key = rcu_dereference(sta->ptk[sta->ptk_idx]);
	if (key) {
		switch (key->conf.cipher) {
		case WLAN_CIPHER_SUITE_TKIP:
			/* we don't want to deal with MMIC in fast-rx */
			goto clear_rcu;
		case WLAN_CIPHER_SUITE_CCMP:
		case WLAN_CIPHER_SUITE_CCMP_256:
		case WLAN_CIPHER_SUITE_GCMP:
		case WLAN_CIPHER_SUITE_GCMP_256:
			break;
		default:
			/* we also don't want to deal with WEP or cipher scheme
			 * since those require looking up the key idx in the
			 * frame, rather than assuming the PTK is used
			 * (we need to revisit this once we implement the real
			 * PTK index, which is now valid in the spec, but we
			 * haven't implemented that part yet)
			 */
			goto clear_rcu;
		}

		fastrx.key = true;
		fastrx.icv_len = key->conf.icv_len;
	}

	assign = true;
 clear_rcu:
	rcu_read_unlock();
 clear:
	__release(check_fast_rx);

	if (assign)
		new = kmemdup(&fastrx, sizeof(fastrx), GFP_KERNEL);

	spin_lock_bh(&sta->lock);
	old = rcu_dereference_protected(sta->fast_rx, true);
	rcu_assign_pointer(sta->fast_rx, new);
	spin_unlock_bh(&sta->lock);

	if (old)
		kfree_rcu(old, rcu_head);
}

void ieee80211_clear_fast_rx(struct sta_info *sta)
{
	struct ieee80211_fast_rx *old;

	spin_lock_bh(&sta->lock);
	old = rcu_dereference_protected(sta->fast_rx, true);
	RCU_INIT_POINTER(sta->fast_rx, NULL);
	spin_unlock_bh(&sta->lock);

	if (old)
		kfree_rcu(old, rcu_head);
}

void __ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_local *local = sdata->local;
	struct sta_info *sta;

	lockdep_assert_held(&local->sta_mtx);

	list_for_each_entry_rcu(sta, &local->sta_list, list) {
		if (sdata != sta->sdata &&
		    (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
			continue;
		ieee80211_check_fast_rx(sta);
	}
}

void ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_local *local = sdata->local;

	mutex_lock(&local->sta_mtx);
	__ieee80211_check_fast_rx_iface(sdata);
	mutex_unlock(&local->sta_mtx);
}

static bool ieee80211_invoke_fast_rx(struct ieee80211_rx_data *rx,
				     struct ieee80211_fast_rx *fast_rx)
{
	struct sk_buff *skb = rx->skb;
	struct ieee80211_hdr *hdr = (void *)skb->data;
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
	struct sta_info *sta = rx->sta;
	int orig_len = skb->len;
	int snap_offs = ieee80211_hdrlen(hdr->frame_control);
	struct {
		u8 snap[sizeof(rfc1042_header)];
		__be16 proto;
	} *payload __aligned(2);
	struct {
		u8 da[ETH_ALEN];
		u8 sa[ETH_ALEN];
	} addrs __aligned(2);
3805 3806 3807 3808
	struct ieee80211_sta_rx_stats *stats = &sta->rx_stats;

	if (fast_rx->uses_rss)
		stats = this_cpu_ptr(sta->pcpu_rx_stats);
J
Johannes Berg 已提交
3809 3810 3811 3812 3813 3814 3815 3816 3817 3818 3819 3820 3821 3822 3823 3824 3825 3826 3827 3828 3829 3830 3831 3832 3833 3834 3835 3836 3837 3838 3839 3840 3841 3842 3843 3844 3845 3846 3847 3848 3849 3850 3851 3852 3853 3854 3855 3856 3857 3858 3859 3860 3861 3862 3863 3864 3865 3866 3867 3868 3869 3870 3871 3872 3873 3874 3875 3876 3877 3878 3879 3880 3881 3882 3883 3884 3885 3886 3887 3888 3889

	/* for parallel-rx, we need to have DUP_VALIDATED, otherwise we write
	 * to a common data structure; drivers can implement that per queue
	 * but we don't have that information in mac80211
	 */
	if (!(status->flag & RX_FLAG_DUP_VALIDATED))
		return false;

#define FAST_RX_CRYPT_FLAGS	(RX_FLAG_PN_VALIDATED | RX_FLAG_DECRYPTED)

	/* If using encryption, we also need to have:
	 *  - PN_VALIDATED: similar, but the implementation is tricky
	 *  - DECRYPTED: necessary for PN_VALIDATED
	 */
	if (fast_rx->key &&
	    (status->flag & FAST_RX_CRYPT_FLAGS) != FAST_RX_CRYPT_FLAGS)
		return false;

	/* we don't deal with A-MSDU deaggregation here */
	if (status->rx_flags & IEEE80211_RX_AMSDU)
		return false;

	if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
		return false;

	if (unlikely(ieee80211_is_frag(hdr)))
		return false;

	/* Since our interface address cannot be multicast, this
	 * implicitly also rejects multicast frames without the
	 * explicit check.
	 *
	 * We shouldn't get any *data* frames not addressed to us
	 * (AP mode will accept multicast *management* frames), but
	 * punting here will make it go through the full checks in
	 * ieee80211_accept_frame().
	 */
	if (!ether_addr_equal(fast_rx->vif_addr, hdr->addr1))
		return false;

	if ((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_FROMDS |
					      IEEE80211_FCTL_TODS)) !=
	    fast_rx->expected_ds_bits)
		goto drop;

	/* assign the key to drop unencrypted frames (later)
	 * and strip the IV/MIC if necessary
	 */
	if (fast_rx->key && !(status->flag & RX_FLAG_IV_STRIPPED)) {
		/* GCMP header length is the same */
		snap_offs += IEEE80211_CCMP_HDR_LEN;
	}

	if (!pskb_may_pull(skb, snap_offs + sizeof(*payload)))
		goto drop;
	payload = (void *)(skb->data + snap_offs);

	if (!ether_addr_equal(payload->snap, fast_rx->rfc1042_hdr))
		return false;

	/* Don't handle these here since they require special code.
	 * Accept AARP and IPX even though they should come with a
	 * bridge-tunnel header - but if we get them this way then
	 * there's little point in discarding them.
	 */
	if (unlikely(payload->proto == cpu_to_be16(ETH_P_TDLS) ||
		     payload->proto == fast_rx->control_port_protocol))
		return false;

	/* after this point, don't punt to the slowpath! */

	if (rx->key && !(status->flag & RX_FLAG_MIC_STRIPPED) &&
	    pskb_trim(skb, skb->len - fast_rx->icv_len))
		goto drop;

	if (unlikely(fast_rx->sta_notify)) {
		ieee80211_sta_rx_notify(rx->sdata, hdr);
		fast_rx->sta_notify = false;
	}

	/* statistics part of ieee80211_rx_h_sta_process() */
3890 3891
	stats->last_rx = jiffies;
	stats->last_rate = sta_stats_encode_rate(status);
J
Johannes Berg 已提交
3892

3893
	stats->fragments++;
J
Johannes Berg 已提交
3894 3895

	if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
3896 3897 3898 3899
		stats->last_signal = status->signal;
		if (!fast_rx->uses_rss)
			ewma_signal_add(&sta->rx_stats_avg.signal,
					-status->signal);
J
Johannes Berg 已提交
3900 3901 3902 3903 3904
	}

	if (status->chains) {
		int i;

3905
		stats->chains = status->chains;
J
Johannes Berg 已提交
3906 3907 3908 3909 3910 3911
		for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
			int signal = status->chain_signal[i];

			if (!(status->chains & BIT(i)))
				continue;

3912 3913 3914 3915
			stats->chain_signal_last[i] = signal;
			if (!fast_rx->uses_rss)
				ewma_signal_add(&sta->rx_stats_avg.chain_signal[i],
						-signal);
J
Johannes Berg 已提交
3916 3917 3918 3919 3920 3921 3922 3923 3924 3925 3926 3927 3928 3929 3930 3931 3932 3933 3934 3935 3936 3937 3938 3939
		}
	}
	/* end of statistics */

	if (rx->key && !ieee80211_has_protected(hdr->frame_control))
		goto drop;

	/* do the header conversion - first grab the addresses */
	ether_addr_copy(addrs.da, skb->data + fast_rx->da_offs);
	ether_addr_copy(addrs.sa, skb->data + fast_rx->sa_offs);
	/* remove the SNAP but leave the ethertype */
	skb_pull(skb, snap_offs + sizeof(rfc1042_header));
	/* push the addresses in front */
	memcpy(skb_push(skb, sizeof(addrs)), &addrs, sizeof(addrs));

	skb->dev = fast_rx->dev;

	ieee80211_rx_stats(fast_rx->dev, skb->len);

	/* The seqno index has the same property as needed
	 * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
	 * for non-QoS-data frames. Here we know it's a data
	 * frame, so count MSDUs.
	 */
3940 3941 3942 3943
	u64_stats_update_begin(&stats->syncp);
	stats->msdu[rx->seqno_idx]++;
	stats->bytes += orig_len;
	u64_stats_update_end(&stats->syncp);
J
Johannes Berg 已提交
3944 3945

	if (fast_rx->internal_forward) {
3946 3947
		struct sk_buff *xmit_skb = NULL;
		bool multicast = is_multicast_ether_addr(skb->data);
J
Johannes Berg 已提交
3948

3949 3950 3951 3952 3953 3954 3955 3956
		if (multicast) {
			xmit_skb = skb_copy(skb, GFP_ATOMIC);
		} else if (sta_info_get(rx->sdata, skb->data)) {
			xmit_skb = skb;
			skb = NULL;
		}

		if (xmit_skb) {
J
Johannes Berg 已提交
3957 3958 3959 3960 3961
			/*
			 * Send to wireless media and increase priority by 256
			 * to keep the received priority instead of
			 * reclassifying the frame (see cfg80211_classify8021d).
			 */
3962 3963 3964 3965 3966
			xmit_skb->priority += 256;
			xmit_skb->protocol = htons(ETH_P_802_3);
			skb_reset_network_header(xmit_skb);
			skb_reset_mac_header(xmit_skb);
			dev_queue_xmit(xmit_skb);
J
Johannes Berg 已提交
3967
		}
3968 3969 3970

		if (!skb)
			return true;
J
Johannes Berg 已提交
3971 3972 3973 3974 3975 3976 3977 3978 3979 3980 3981 3982 3983
	}

	/* deliver to local stack */
	skb->protocol = eth_type_trans(skb, fast_rx->dev);
	memset(skb->cb, 0, sizeof(skb->cb));
	if (rx->napi)
		napi_gro_receive(rx->napi, skb);
	else
		netif_receive_skb(skb);

	return true;
 drop:
	dev_kfree_skb(skb);
3984
	stats->dropped++;
J
Johannes Berg 已提交
3985 3986 3987
	return true;
}

3988 3989 3990 3991 3992 3993 3994 3995 3996 3997 3998 3999 4000 4001
/*
 * This function returns whether or not the SKB
 * was destined for RX processing or not, which,
 * if consume is true, is equivalent to whether
 * or not the skb was consumed.
 */
static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
					    struct sk_buff *skb, bool consume)
{
	struct ieee80211_local *local = rx->local;
	struct ieee80211_sub_if_data *sdata = rx->sdata;

	rx->skb = skb;

J
Johannes Berg 已提交
4002 4003 4004 4005 4006 4007 4008 4009 4010 4011 4012 4013 4014 4015 4016
	/* See if we can do fast-rx; if we have to copy we already lost,
	 * so punt in that case. We should never have to deliver a data
	 * frame to multiple interfaces anyway.
	 *
	 * We skip the ieee80211_accept_frame() call and do the necessary
	 * checking inside ieee80211_invoke_fast_rx().
	 */
	if (consume && rx->sta) {
		struct ieee80211_fast_rx *fast_rx;

		fast_rx = rcu_dereference(rx->sta->fast_rx);
		if (fast_rx && ieee80211_invoke_fast_rx(rx, fast_rx))
			return true;
	}

4017
	if (!ieee80211_accept_frame(rx))
4018 4019 4020 4021 4022 4023 4024
		return false;

	if (!consume) {
		skb = skb_copy(skb, GFP_ATOMIC);
		if (!skb) {
			if (net_ratelimit())
				wiphy_debug(local->hw.wiphy,
4025
					"failed to copy skb for %s\n",
4026 4027 4028 4029 4030 4031 4032 4033 4034 4035 4036
					sdata->name);
			return true;
		}

		rx->skb = skb;
	}

	ieee80211_invoke_rx_handlers(rx);
	return true;
}

4037
/*
4038
 * This is the actual Rx frames handler. as it belongs to Rx path it must
4039
 * be called with rcu_read_lock protection.
4040
 */
4041
static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
4042
					 struct ieee80211_sta *pubsta,
4043 4044
					 struct sk_buff *skb,
					 struct napi_struct *napi)
4045 4046 4047 4048
{
	struct ieee80211_local *local = hw_to_local(hw);
	struct ieee80211_sub_if_data *sdata;
	struct ieee80211_hdr *hdr;
Z
Zhu Yi 已提交
4049
	__le16 fc;
4050
	struct ieee80211_rx_data rx;
4051
	struct ieee80211_sub_if_data *prev;
4052
	struct rhlist_head *tmp;
Z
Zhu Yi 已提交
4053
	int err = 0;
4054

Z
Zhu Yi 已提交
4055
	fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
4056 4057 4058
	memset(&rx, 0, sizeof(rx));
	rx.skb = skb;
	rx.local = local;
4059
	rx.napi = napi;
4060

Z
Zhu Yi 已提交
4061
	if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
4062
		I802_DEBUG_INC(local->dot11ReceivedFragmentCount);
4063

4064 4065 4066 4067 4068 4069 4070
	if (ieee80211_is_mgmt(fc)) {
		/* drop frame if too short for header */
		if (skb->len < ieee80211_hdrlen(fc))
			err = -ENOBUFS;
		else
			err = skb_linearize(skb);
	} else {
Z
Zhu Yi 已提交
4071
		err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
4072
	}
Z
Zhu Yi 已提交
4073 4074 4075 4076 4077 4078 4079

	if (err) {
		dev_kfree_skb(skb);
		return;
	}

	hdr = (struct ieee80211_hdr *)skb->data;
4080
	ieee80211_parse_qos(&rx);
4081
	ieee80211_verify_alignment(&rx);
4082

J
Johannes Berg 已提交
4083 4084 4085 4086
	if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
		     ieee80211_is_beacon(hdr->frame_control)))
		ieee80211_scan_rx(local, skb);

4087 4088 4089 4090 4091 4092 4093 4094
	if (pubsta) {
		rx.sta = container_of(pubsta, struct sta_info, sta);
		rx.sdata = rx.sta->sdata;
		if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
			return;
		goto out;
	} else if (ieee80211_is_data(fc)) {
		struct sta_info *sta, *prev_sta;
4095

4096
		prev_sta = NULL;
4097

4098
		for_each_sta_info(local, hdr->addr2, sta, tmp) {
4099 4100 4101 4102 4103 4104 4105
			if (!prev_sta) {
				prev_sta = sta;
				continue;
			}

			rx.sta = prev_sta;
			rx.sdata = prev_sta->sdata;
4106
			ieee80211_prepare_and_rx_handle(&rx, skb, false);
4107

4108
			prev_sta = sta;
4109
		}
4110 4111 4112 4113 4114

		if (prev_sta) {
			rx.sta = prev_sta;
			rx.sdata = prev_sta->sdata;

4115
			if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4116
				return;
4117
			goto out;
4118
		}
4119 4120
	}

4121
	prev = NULL;
4122

4123 4124 4125
	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
		if (!ieee80211_sdata_running(sdata))
			continue;
J
Johannes Berg 已提交
4126

4127 4128 4129
		if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
		    sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
			continue;
J
Johannes Berg 已提交
4130

4131 4132 4133 4134 4135
		/*
		 * frame is destined for this interface, but if it's
		 * not also for the previous one we handle that after
		 * the loop to avoid copying the SKB once too much
		 */
4136

4137
		if (!prev) {
4138
			prev = sdata;
4139
			continue;
J
Johannes Berg 已提交
4140
		}
4141

4142
		rx.sta = sta_info_get_bss(prev, hdr->addr2);
4143 4144
		rx.sdata = prev;
		ieee80211_prepare_and_rx_handle(&rx, skb, false);
4145

4146 4147 4148 4149
		prev = sdata;
	}

	if (prev) {
4150
		rx.sta = sta_info_get_bss(prev, hdr->addr2);
4151
		rx.sdata = prev;
4152

4153 4154
		if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
			return;
4155
	}
4156

4157
 out:
4158
	dev_kfree_skb(skb);
4159
}
4160 4161 4162 4163 4164

/*
 * This is the receive path handler. It is called by a low level driver when an
 * 802.11 MPDU is received from the hardware.
 */
4165 4166
void ieee80211_rx_napi(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta,
		       struct sk_buff *skb, struct napi_struct *napi)
4167 4168
{
	struct ieee80211_local *local = hw_to_local(hw);
4169 4170
	struct ieee80211_rate *rate = NULL;
	struct ieee80211_supported_band *sband;
4171
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
4172

4173 4174
	WARN_ON_ONCE(softirq_count() == 0);

4175
	if (WARN_ON(status->band >= NUM_NL80211_BANDS))
J
Johannes Berg 已提交
4176
		goto drop;
4177 4178

	sband = local->hw.wiphy->bands[status->band];
J
Johannes Berg 已提交
4179 4180
	if (WARN_ON(!sband))
		goto drop;
4181

J
Johannes Berg 已提交
4182 4183 4184 4185 4186 4187 4188
	/*
	 * If we're suspending, it is possible although not too likely
	 * that we'd be receiving frames after having already partially
	 * quiesced the stack. We can't process such frames then since
	 * that might, for example, cause stations to be added or other
	 * driver callbacks be invoked.
	 */
J
Johannes Berg 已提交
4189 4190
	if (unlikely(local->quiescing || local->suspended))
		goto drop;
J
Johannes Berg 已提交
4191

4192 4193 4194 4195
	/* We might be during a HW reconfig, prevent Rx for the same reason */
	if (unlikely(local->in_reconfig))
		goto drop;

4196 4197 4198 4199
	/*
	 * The same happens when we're not even started,
	 * but that's worth a warning.
	 */
J
Johannes Berg 已提交
4200 4201
	if (WARN_ON(!local->started))
		goto drop;
4202

4203
	if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
4204
		/*
4205 4206
		 * Validate the rate, unless a PLCP error means that
		 * we probably can't have a valid rate here anyway.
4207
		 */
4208 4209 4210 4211 4212 4213 4214 4215 4216 4217 4218 4219

		if (status->flag & RX_FLAG_HT) {
			/*
			 * rate_idx is MCS index, which can be [0-76]
			 * as documented on:
			 *
			 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
			 *
			 * Anything else would be some sort of driver or
			 * hardware error. The driver should catch hardware
			 * errors.
			 */
J
Johannes Berg 已提交
4220
			if (WARN(status->rate_idx > 76,
4221 4222 4223 4224 4225 4226
				 "Rate marked as an HT rate but passed "
				 "status->rate_idx is not "
				 "an MCS index [0-76]: %d (0x%02x)\n",
				 status->rate_idx,
				 status->rate_idx))
				goto drop;
4227 4228 4229 4230 4231 4232 4233
		} else if (status->flag & RX_FLAG_VHT) {
			if (WARN_ONCE(status->rate_idx > 9 ||
				      !status->vht_nss ||
				      status->vht_nss > 8,
				      "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
				      status->rate_idx, status->vht_nss))
				goto drop;
4234
		} else {
J
Johannes Berg 已提交
4235
			if (WARN_ON(status->rate_idx >= sband->n_bitrates))
4236 4237 4238
				goto drop;
			rate = &sband->bitrates[status->rate_idx];
		}
4239
	}
4240

4241 4242
	status->rx_flags = 0;

4243 4244 4245 4246 4247 4248 4249 4250 4251 4252 4253 4254 4255
	/*
	 * key references and virtual interfaces are protected using RCU
	 * and this requires that we are in a read-side RCU section during
	 * receive processing
	 */
	rcu_read_lock();

	/*
	 * Frames with failed FCS/PLCP checksum are not returned,
	 * all other frames are returned without radiotap header
	 * if it was previously present.
	 * Also, frames with less than 16 bytes are dropped.
	 */
4256
	skb = ieee80211_rx_monitor(local, skb, rate);
4257 4258 4259 4260 4261
	if (!skb) {
		rcu_read_unlock();
		return;
	}

4262 4263 4264
	ieee80211_tpt_led_trig_rx(local,
			((struct ieee80211_hdr *)skb->data)->frame_control,
			skb->len);
4265 4266

	__ieee80211_rx_handle_packet(hw, pubsta, skb, napi);
4267 4268

	rcu_read_unlock();
J
Johannes Berg 已提交
4269 4270 4271 4272

	return;
 drop:
	kfree_skb(skb);
4273
}
4274
EXPORT_SYMBOL(ieee80211_rx_napi);
4275 4276 4277

/* This is a version of the rx handler that can be called from hard irq
 * context. Post the skb on the queue and schedule the tasklet */
4278
void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
4279 4280 4281 4282 4283 4284 4285 4286 4287 4288
{
	struct ieee80211_local *local = hw_to_local(hw);

	BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));

	skb->pkt_type = IEEE80211_RX_MSG;
	skb_queue_tail(&local->skb_queue, skb);
	tasklet_schedule(&local->tasklet);
}
EXPORT_SYMBOL(ieee80211_rx_irqsafe);